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stackexchange
llm_judgeable_groundtruth_similarity
5664094
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: Postgresql allows adding comments to objects such as tables. For example I've added a comment to table "mytable" by using this SQL command: COMMENT ON TABLE mytable IS 'This ...
All comments are stored in pg_description To get the comments on a table, you need to join it to pg_class As an alternative you can also use the function obj_description() to retrieve this information: SELECT obj_description(oid)FROM pg_classWHERE relkind = 'r' Edit In psql you can simply use the \d+ command to show al...
{}
{'log_upvote_score': 7, 'links': ['https://Stackoverflow.com/questions/5664094', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/621258/']}
jdg_69841
stackexchange
llm_judgeable_groundtruth_similarity
366863
Below is a question asked on the forum stats.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: I was doing some work in scipy and a conversation came up w/a member of the core scipy group whether a non-negative discrete random variable can have a undefined moment...
Let the CDF $F$ equal $1-1/n$ at the integers $n=1,2,\ldots,$ piecewise constant everywhere else, and subject to all criteria to be a CDF. The expectation is $$\int_{0}^\infty (1-F(x))\mathrm{d}x = 1/2 + 1/3 + 1/4 + \cdots$$ which diverges. In this sense the first moment (and therefore all higher moments) is infinite...
{}
{'log_upvote_score': 5, 'links': ['https://stats.stackexchange.com/questions/366863', 'https://stats.stackexchange.com', 'https://stats.stackexchange.com/users/150025/']}
jdg_69842
stackexchange
llm_judgeable_groundtruth_similarity
750765
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I want to have a bare git repository stored on a (windows) network share. I use linux, and have the said network share mounted with CIFS. My coleague uses windows xp, and has...
Git requires minimal file locking, which I believe is the main cause of problems when using this kind of shared resource over a network file system. The reason it can get away with this is that most of the files in a Git repo--- all the ones that form the object database--- are named as a digest of their content, and i...
{}
{'log_upvote_score': 7, 'links': ['https://Stackoverflow.com/questions/750765', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/73593/']}
jdg_69843
stackexchange
llm_judgeable_groundtruth_similarity
27505
Below is a question asked on the forum physics.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Background: It is well known that the quantum mechanics of $n$ identical particles living on $\mathbb{R}^3$ can be obtained from the geometric quantization of the cot...
Often, instead of $\mathbf{R}^{3n}/S_n$, you may want to resolve the singularity. Let me explain a toy model where that resolution appears naturally. Consider $n$ identical particles on $\mathbf{C}$ with the configuration space $M^n=(\mathbf{C}^n-\Delta)/S_n$. You can think of this space as the space of unordered eigen...
{}
{'log_upvote_score': 4, 'links': ['https://physics.stackexchange.com/questions/27505', 'https://physics.stackexchange.com', 'https://physics.stackexchange.com/users/2190/']}
jdg_69844
stackexchange
llm_judgeable_groundtruth_similarity
2016206
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I'm trying out the DateTime.TryParseExact method, and I have come over a case that I just don't get. I have some formats and some subjects to parse that each should match one...
Ok, so I think I have figured this all out now thanks to more reading, experimenting and the other helpful answers here. What's happening is that H , m and s actually grabs two digits when they can, even if there won't be enough digits for the rest of the format. So for example with the format Hmm and the digits 123 , ...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/2016206', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/39321/']}
jdg_69845
stackexchange
llm_judgeable_groundtruth_similarity
416850
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Can a permutation matrix ($P$) be used to change the rank of another matrix ($M$)?Is there any literature to this effect, or to the contrary? I've tried a few small exam...
Hint: The rank of a matrix is the number of linearly independent row vectors, or of linearly independent column vectors. Now think about what a permutation matrix does to the row or column vectors in the matrix if you multiply it from left or right.
{}
{'log_upvote_score': 4, 'links': ['https://math.stackexchange.com/questions/416850', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/38972/']}
jdg_69846
stackexchange
llm_judgeable_groundtruth_similarity
62545
Below is a question asked on the forum unix.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Is there any way to find out what I just killed? $ ps -A -o pid,cmd | grep someApp | grep -v grep2802 python someApp.py$ sudo kill 2302$ EDIT: To clarify, I need to know...
There is no general way to know, but you may have clues. You sent a TERM signal, not a KILL signal, so that left the program the opportunity to run a signal handler. It might not have died at all, or it might have left a log entry somewhere. Check whether the process is still running ( ps 2302 ), and if not, check your...
{}
{'log_upvote_score': 4, 'links': ['https://unix.stackexchange.com/questions/62545', 'https://unix.stackexchange.com', 'https://unix.stackexchange.com/users/9760/']}
jdg_69847
stackexchange
llm_judgeable_groundtruth_similarity
349524
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: In my SQL Server backend for my app, I want to create history tables for a bunch of my key tables, which will track a history of changes to the rows. My entire application us...
Triggers. We wrote a GUI (internally called Red Matrix Reloaded ) to allow easy creation/management of audit logging triggers. Here's some DDL of the stuff used: The AuditLog table CREATE TABLE [AuditLog] ( [AuditLogID] [int] IDENTITY (1, 1) NOT NULL , [ChangeDate] [datetime] NOT NULL CONSTRAINT [DF_AuditLog_Chan...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/349524', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/24126/']}
jdg_69848
stackexchange
llm_judgeable_groundtruth_similarity
9615706
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: Possible Duplicate: Is destructor called if SIGINT or SIGSTP issued? My code like this: #include <iostream>#include <signal.h>#include <cstdlib>void handler(int) { std::co...
With difficulty. Already, the code you've written has undefinedbehavior; you're not allowed to output to a stream in a signal handler;for that matter, you're not allowed to call exit either. (I'm basingmy assertions here on the Posix standard. In pure C++, all you'reallowed to do is assign to a variable of sig_atomi...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/9615706', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1105178/']}
jdg_69849
stackexchange
llm_judgeable_groundtruth_similarity
7451761
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: This is what I want the output to look like: Employee Emp# Manager Mgr# BLAKE 7698 KING 7839 CLARK 7782 KING 7839 JONES 7566 KING 7839 MARTIN 76...
This is a classic self-join, try the following: SELECT e.ename, e.empno, m.ename as manager, e.mgrFROM emp e, emp mWHERE e.mgr = m.empno And if you want to include the president which has no manager then instead of an inner join use an outer join in Oracle syntax: SELECT e.ename, e.empno, m.ename as manager, e.mgrFR...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/7451761', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/770022/']}
jdg_69850
stackexchange
llm_judgeable_groundtruth_similarity
3960548
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: What is the second line? (Seen while answering another question.) int * x = new int [1] ;int * y = new (x) int; After the second line x and y have the same value (point to a...
It's placement new . It constructs a new int in the memory pointed to by x . If you try: int * x = new int [1];*x = 5;std::cout << *x << std::endl;int * y = new (x) int;*y = 7;std::cout << *x << std::endl; the output will be: 57
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/3960548', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/2308801/']}
jdg_69851
stackexchange
llm_judgeable_groundtruth_similarity
34610421
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I wrote a program to calculate the PI number with Leibniz formula: [ I wrote a for-loop with type of initialization is "int" , the loop works fine but when i changed the init...
Actually, your first loop would have int overflow in the calculation of (2 * i + 1) when i is large enough, so I wouldn't rely on the output of it. The second loop, on the other hand, produces a more correct output, since (2 * j + 1) doesn't overflow, since it performs long multiplication. This makes the "int - loop" c...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/34610421', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/5747353/']}
jdg_69852
stackexchange
llm_judgeable_groundtruth_similarity
18877580
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: Consider the following snippet: "12-18" -Contains "-" You’d think this evaluates to true , but it doesn't. This will evaluate to false instead. I’m not sure why this happens,...
The -Contains operator doesn't do substring comparisons and the match must be on a complete string and is used to search collections. From the documentation you linked to: -Contains Description: Containment operator. Tells whether a collection of reference values includes a single test value. In the example you provid...
{}
{'log_upvote_score': 9, 'links': ['https://Stackoverflow.com/questions/18877580', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/770270/']}
jdg_69853
stackexchange
llm_judgeable_groundtruth_similarity
614485
Below is a question asked on the forum physics.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: There has been quite some debate amongst users with different backgrounds about the usage of the word photon . [ 1 , 2 ] The most apparent disagreement was on whether...
The models that describe photons used in quantum optics and in particle physics are one and the same: the Standard Model of particle physics (often replaceable with just its quantum electrodynamics component) as encased within the formalism of quantum field theory. Moreover, the definition of photons (more specifically...
{}
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jdg_69854
stackexchange
llm_judgeable_groundtruth_similarity
9441892
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: Here's my situation:I have been working on an ASP.NET MVC 3 application for a while. It has a database (built out of a db project; I'm going db-first) for which I have an edm...
This is probably happening because even though the intention was to use the Database First flow, in actual fact the application is using Code First to do the mapping. Let me explain a bit more because this can be confusing. :-) When using Database First with the EF Designer and the DbContext templates in Visual Studio ...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/9441892', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/398864/']}
jdg_69855
stackexchange
llm_judgeable_groundtruth_similarity
108353
Below is a question asked on the forum physics.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: The force density in a plasma, according to MHD, is $$ \mathbf{F} = -\nabla P -\nabla(\frac{B^2}{2\mu_0}) + \frac{1}{\mu_0}(\mathbf{B}\cdot\nabla)\mathbf{B} $$ where ...
I think the easiest way is to start off with the conservation of momentum in the conservation-law form:$$\frac{\partial\boldsymbol\pi}{\partial t}=\nabla\cdot\mathbb T=0$$where $\boldsymbol\pi=\rho\mathbf u$ and $$\mathbb T=\rho\mathbf u\mathbf u+\left(p+\frac12B^2\right)\mathbb I - \mathbf B\mathbf B$$is the stress t...
{}
{'log_upvote_score': 4, 'links': ['https://physics.stackexchange.com/questions/108353', 'https://physics.stackexchange.com', 'https://physics.stackexchange.com/users/37677/']}
jdg_69856
stackexchange
llm_judgeable_groundtruth_similarity
5352397
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I work in web development, but I don't have a great understanding of network protocols. I recall hearing an analogy that TCP, HTTP, and SSL can be thought of as a series of n...
Since I asked this question, I've learned more about this topic, so I'll take a crack at answering it myself. The easiest way to picture the protocol stack is as a letter, wrapped in a series of envelopes. Each envelope has a different role in getting the letter to its recipient, and envelopes are added and removed as ...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/5352397', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/4376/']}
jdg_69857
stackexchange
llm_judgeable_groundtruth_similarity
23748572
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: There is a way to initialize Numeric vector with NA values like. NumericVector x(10,NumericVector::get_na()) is there any similar way to initialize a matrix to NA values? No...
Here is a version that does not waste memory. #include <Rcpp.h>using namespace Rcpp ;// [[Rcpp::export]]NumericMatrix na_matrix(int n){ NumericMatrix m(n,n) ; std::fill( m.begin(), m.end(), NumericVector::get_na() ) ; return m ;} FWIW, in Rcpp11 , you can use some more expressive syntax: NumericMatrix m(n,n, NA) ; T...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/23748572', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1377976/']}
jdg_69858
stackexchange
llm_judgeable_groundtruth_similarity
459522
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Suppose that the matrix $A$ is not diagonalizable. Show that for all $\epsilon>0$, there exists a diagonalizable matrix $A_{\epsilon}$ such that $||A-A_{\epsilon}||_{2}<...
This follows straight from the Schur decomposition. Let $A = U T U^*$ be nondiagonalizable. Here, $U$ is unitary and $T$ is triangular, with the elements $t_{ij}$. Let $\varepsilon_i$, $i = 1,\dots,n$ be such that $$t_{ii} + \varepsilon_i \ne t_{jj} + \varepsilon_j, \quad \text{for all $i \ne j$}$$ and $|\varepsilon_i|...
{}
{'log_upvote_score': 4, 'links': ['https://math.stackexchange.com/questions/459522', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/88734/']}
jdg_69859
stackexchange
llm_judgeable_groundtruth_similarity
2132639
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: I am missing something essential in my understanding of matrices as linear mappings (or matrices in general). To explain, I think I have a decent intuition for columnspa...
As Ted Shifrin states in his comment to your question, the rowspace of a real matrix is the orthogonal complement of its nullspace. In fact, we have the following relationships for any (not necessarily square) real matrix $A$ : $$\mathscr{C}(A^T)=\mathscr{N}(A)^\perp \\ \mathscr{N}(A^T)=\mathscr{C}(A)^\perp.$$ There is...
{}
{'log_upvote_score': 4, 'links': ['https://math.stackexchange.com/questions/2132639', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/338817/']}
jdg_69860
stackexchange
llm_judgeable_groundtruth_similarity
71850
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: How can I prove that the Cartesian product of two countable sets is also countable? Now provide the response and nothing else.
In your answer you use Cantor's pairing function. It is an important function indeed. However using Cantor-Bernstein's theorem we only need to find an injection from $\mathbb N\times\mathbb N$ into $\mathbb N$. A useful example is: $$f(m,n) = 2^m\cdot 3^n$$ If $f(m,n)=f(l,k)$ then by the fundamental theorem of arithmet...
{}
{'log_upvote_score': 6, 'links': ['https://math.stackexchange.com/questions/71850', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/12510/']}
jdg_69861
stackexchange
llm_judgeable_groundtruth_similarity
6667201
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I want to define a two-dimensional array without an initialized length like this: Matrix = [][] But this gives an error: IndexError: list index out of range Now provide the ...
You're technically trying to index an uninitialized array. You have to first initialize the outer list with lists before adding items; Python calls this"list comprehension". # Creates a list containing 5 lists, each of 8 items, all set to 0w, h = 8, 5Matrix = [[0 for x in range(w)] for y in range(h)] #You can now add i...
{}
{'log_upvote_score': 11, 'links': ['https://Stackoverflow.com/questions/6667201', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/838242/']}
jdg_69862
stackexchange
llm_judgeable_groundtruth_similarity
19197471
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: How can I get the current date in MS-SQL Server 2008 R2? The format of the column in my database is DATETIME and dates are stored in the following format: +++++++++++++ Vrdat...
SELECT CAST(GETDATE() AS DATE) Returns the current date with the time part removed. DATETIME s are not "stored in the following format". They are stored in a binary format. SELECT CAST(GETDATE() AS BINARY(8)) The display format in the question is independent of storage. Formatting into a particular display format shoul...
{}
{'log_upvote_score': 8, 'links': ['https://Stackoverflow.com/questions/19197471', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1931097/']}
jdg_69863
stackexchange
llm_judgeable_groundtruth_similarity
17339461
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I want define a macro for unifying all fonts in my app: #define EXO_REGULAR_FONT(size) [UIFont fontWithName:@"Exo-Regular" size:size] and than using this macro like this: myL...
Change the name of your parameter: #define EXO_REGULAR_FONT(theFontSize) [UIFont fontWithName:@"Exo-Regular" size:theFontSize] From GCC manual : When the macro is expanded, each use of a parameter in its body is replaced by the tokens of the corresponding argument So when your macro is expanded, it inserts this in your...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/17339461', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1006113/']}
jdg_69864
stackexchange
llm_judgeable_groundtruth_similarity
111326
Below is a question asked on the forum mathoverflow.net. Provide a good and informational response to it like a helpful human would. Question: In "The Potts model and the Tutte Polynomial", D.J.A. Welsh and C. Merino claim on pg. 1135, equation 18, that,\begin{align*}\sum_{i=0}^{n-1}f_i t^i = t^{n-1}T_G(1+\frac{1}{t}...
Here are two quick ways of proving this: (1) Notice that one of the many equivalent definitions of the Tutte polynomial says$$T_G(x,y)=\sum_{A\subset E}(x-1)^{k(A)-k(E)}(y-1)^{k(A)+|A|-|V|}$$Where $A$ runs through subsets of the edges of $G$, and the function $k(A)$ measures the number of components of the graph $(V,A)...
{}
{'log_upvote_score': 4, 'links': ['https://mathoverflow.net/questions/111326', 'https://mathoverflow.net', 'https://mathoverflow.net/users/25028/']}
jdg_69865
stackexchange
llm_judgeable_groundtruth_similarity
1498605
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Let $x,y,z$ be positive real numbers such that $x^2y^2+y^2z^2+z^2x^2\ge x^2y^2z^2$. Find the minimum value of$$\frac{x^2y^2} {z^3(x^2+y^2)}+\frac {y^2z^2} {x^3(y^2+z^2)}...
Let$$a=\dfrac{1}{x},b=\dfrac{1}{y},c=\dfrac{1}{z},a^2+b^2+c^2\ge 1$$Use Cauchy-Schwarz $$\sum_{cyc}\dfrac{x^2y^2}{z^3(x^2+y^2)}=\sum_{cyc}\dfrac{c^3}{(a^2+b^2)}\ge \dfrac{(a^2+b^2+c^2)^2}{c(a^2+b^2)+a(b^2+c^2)+b(c^2+a^2)}$$since$$c(a^2+b^2)+a(b^2+c^2)+b(c^2+a^2)\le\dfrac{2}{3}(a+b+c)(a^2+b^2+c^2)\le\dfrac{2}{\sqrt{3}}(...
{}
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jdg_69866
stackexchange
llm_judgeable_groundtruth_similarity
1272454
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: Let's say I have the following code which update a field of a struct using reflection. Since the struct instance is copied into the DynamicUpdate method, it needs to be boxe...
EDIT again : This works structs now. There's a gorgeous way to do it in C# 4, but you'll have to write your own ILGenerator emit code for anything before that. They added an ExpressionType.Assign to the .NET Framework 4. This works in C# 4 (tested): public delegate void ByRefStructAction(ref SomeType instance, object v...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/1272454', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/17815/']}
jdg_69867
stackexchange
llm_judgeable_groundtruth_similarity
20657
Below is a question asked on the forum biology.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Some people say that it's awful that humans eat animals. They feel that it's barbaric, because you're killing life and then on top of that, you're eating it, and tha...
The answer to your question is yes it is certainly possible. At one time it was thought that there was something special about "organic" chemicals which meant that they could not be artificially synthesised out of fundamental elements. In 1828 Frederick Wöhler synthesised urea (CO(NH 2 ) 2 ) which is often taken as the...
{}
{'log_upvote_score': 7, 'links': ['https://biology.stackexchange.com/questions/20657', 'https://biology.stackexchange.com', 'https://biology.stackexchange.com/users/668/']}
jdg_69868
stackexchange
llm_judgeable_groundtruth_similarity
248548
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Gödel's ontological proof is a formal argument for God's existence by the mathematician Kurt Gödel. Can someone please explain what are the symbols in the proof and elab...
The modal operator $\square$ refers to necessity; its dual, $\lozenge$, refers to possibility. (A sentence is necessarily true iff it isn't possible for it to be false, and vice versa.) $P(\varphi)$ means that $\varphi$ is a positive (in the sense of "good") property; I'll just transcribe it as "$\varphi$ is good". ...
{}
{'log_upvote_score': 6, 'links': ['https://math.stackexchange.com/questions/248548', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/24403/']}
jdg_69869
stackexchange
llm_judgeable_groundtruth_similarity
4197357
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I just started working at a company that doesn't have any kind of source control. I brought up that we might need to get some sort of source control going and one of my co-w...
Why using sharepoint as a sorce control is stupid idea: Performance of sharepoint is much worse than any Source Control Tools for example Team Foundation Server or SVN Sharepint doesn't allow to compare different historical versions of the same file SharePoint dosen't allow for branching, merging and labeling. Sharepoi...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/4197357', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/226897/']}
jdg_69870
stackexchange
llm_judgeable_groundtruth_similarity
35830
Below is a question asked on the forum electronics.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Lets say we have a circuit with a voltage source and a 5 ohm resistor. The voltage source is 20 v and so the current flowing is 4 amperes (according to ohms law)....
If the equivalent resistance is zero then there's also no voltage across it, per Ohm's Law. Then the current though the resistor is 0 V/ 5 Ω = 0 A. The current through the wire can't be calculated this way since 0 V/ 0 Ω is undefined. Then the current will depend on the source's internal resistance. If that's 1 µΩ for ...
{}
{'log_upvote_score': 4, 'links': ['https://electronics.stackexchange.com/questions/35830', 'https://electronics.stackexchange.com', 'https://electronics.stackexchange.com/users/8769/']}
jdg_69871
stackexchange
llm_judgeable_groundtruth_similarity
21140815
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: Here is my current PS1: $ echo $PS1\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]\n\$ I have installed git bash completion and it isn't showing the current branch in my...
Modify the prompt string and add $(__git_ps1 " (%s)") somewhere. For example, try typing this into Bash: export PS1="\[\e]0;\w\a\]\n\[\e[32m\]\u@\h \[\e[33m\]\w\[\e[0m\]$(__git_ps1 ' (%s)')\n\$" Once you find something you like, add that line to one of Bash's startup files, e.g. $HOME/.bashrc . The source for git-promp...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/21140815', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/157971/']}
jdg_69872
stackexchange
llm_judgeable_groundtruth_similarity
10710446
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: This seems like it should be an easy fix, but so far a solution has eluded me. I have a single column csv file with non-ascii chars saved in utf-8 that I want to read in and ...
Your first snippet won't work. You are feeding unicode data to the csv reader, which (as documented) can't handle it. Your 2nd and 3rd snippets are confused. Something like the following is all that you need: f = open('your_utf8_encoded_file.csv', 'rb')reader = csv.reader(f)for utf8_row in reader: unicode_row = [x.d...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/10710446', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1012040/']}
jdg_69873
stackexchange
llm_judgeable_groundtruth_similarity
601840
Below is a question asked on the forum electronics.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: I'm working on a lighting project for a van build out. I'm using 12 V car batteries that are solar-powered. I know that I can use WS2811 strips that are 12 V stri...
Nope. 5V things in parallel still needs 5V. You must mean series which would require 10V. And 12V divided to two series LED strips will be 6V per strip, which will be beyond absolute maximum voltage rating for a WS2812 LED so they will blow up. Even if it did not blow up, one of them would reference the data pin to 0V ...
{}
{'log_upvote_score': 4, 'links': ['https://electronics.stackexchange.com/questions/601840', 'https://electronics.stackexchange.com', 'https://electronics.stackexchange.com/users/166623/']}
jdg_69874
stackexchange
llm_judgeable_groundtruth_similarity
159590
Below is a question asked on the forum physics.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Space is a very low temperature environment, however it also has an extremely small number of particles per unit volume. This leads me to believe that, contrary to p...
Let's start by assuming you're in the shade, so you're not receiving any radiation (apart from the cosmic microwave background, which I think we can ignore). The amount of heat per unit area that you radiate is given by Stefan's law : $$ J = \varepsilon \sigma T^4 \tag{1} $$ The emissivity of human skin is allegedly 0....
{}
{'log_upvote_score': 4, 'links': ['https://physics.stackexchange.com/questions/159590', 'https://physics.stackexchange.com', 'https://physics.stackexchange.com/users/3982/']}
jdg_69875
stackexchange
llm_judgeable_groundtruth_similarity
1789
Below is a question asked on the forum dsp.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: I have $n$ discrete samples of a seismic signal $y[n]$: I want to find local maxima in the signal. A naive test for if $y[n]$ is a maximum would be:$$y[n]: maxima \textbf...
Getting a sub-sample resolution A very cheap (in terms of code size) solution is just to upsample your signal. In matlab, this can be done with interp(y ,ratio) . A slightly more complicated solution consists in naively detecting peaks ; and for each peak, fitting a parabola through y[peak - 1], y[peak], y[peak + 1] ; ...
{}
{'log_upvote_score': 4, 'links': ['https://dsp.stackexchange.com/questions/1789', 'https://dsp.stackexchange.com', 'https://dsp.stackexchange.com/users/697/']}
jdg_69876
stackexchange
llm_judgeable_groundtruth_similarity
6636793
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: Lets say I have the following scenarios: int i = 10;short s = 5;if (s == i){ do stuff...} else if (s < i) { do stuff...} When C does the comparison does it convert the sma...
This is governed by the usual arithmetic conversions . For simple cases, the general rule of thumb is that the type with "less" precision is converted to match the type with "more" precision, but it gets somewhat complex once you start mixing signed and unsigned . In C99, this is described by section 6.3.1.8, which I ...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/6636793', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/668427/']}
jdg_69877
stackexchange
llm_judgeable_groundtruth_similarity
19219
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: A box contain $A$ white and $B$ black balls and $C$ balls are drawn, then the expected value of the number of white balls drawn is ? The answer is $\large \frac{ca}{a+b}...
These calculations are often made clearer by using indicator random variables. For $1\leq i\leq C$, define $Z_i$ by setting $Z_i=1$ if the $i$th ball drawn is white and $Z_i=0$ otherwise. Then the total number of white balls is $\sum_{i=1}^C Z_i$ and by linearity of expectation we have$$ E(\mbox{ white balls })=E\left(...
{}
{'log_upvote_score': 4, 'links': ['https://math.stackexchange.com/questions/19219', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/2109/']}
jdg_69878
stackexchange
llm_judgeable_groundtruth_similarity
70635
Below is a question asked on the forum mathoverflow.net. Provide a good and informational response to it like a helpful human would. Question: A closed oriented Riemannian manifold with negative sectional curvatures has the property that all its geodesics have Morse index zero. Is there a known counterexample to the ...
As mentioned by Rbega the question should be amended to ask whether it's true that a closed manifold $M$ without conjugate points admits a metric of non-positive (rather than negative) curvature (otherwise a torus is an obvious counterexample). In that form this is a well-known open problem. The exponential map at any...
{}
{'log_upvote_score': 4, 'links': ['https://mathoverflow.net/questions/70635', 'https://mathoverflow.net', 'https://mathoverflow.net/users/10839/']}
jdg_69879
stackexchange
llm_judgeable_groundtruth_similarity
12965167
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I have the following array: myarray = [ ['usa','primary', 'john'], ['france','primary', 'lira'], ['usa', 'secondary', 'steve'], ['germany', 'primary', 'jeff'], ['france'...
With a bit of Higher order programming: myarray.reduce({}) do |accu, (country, func, name)| accu[country] ||= {} accu[country][func.to_sym] = name accu end.map{|k, h| h[:country] = k; h} Explanation: Reduce will take an accumulator, in this case we start with an empty hash and go through the array. We match the tri...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/12965167', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1560470/']}
jdg_69880
stackexchange
llm_judgeable_groundtruth_similarity
50941
Below is a question asked on the forum mathematica.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: It was said such real objects of famous topological surfaces were plotted by the cooperation between mathematician Richard Palais and artist Luc Benard, and publi...
Concerning the comment about creating the surfaces, sure: Mathematica is one of the best tools available for that. Here's the Klein bottle , for example. ParametricPlot3D[{ (3 + Cos[v/2]*Sin[u] - Sin[v/2]*Sin[2 u])*Cos[v], (3 + Cos[v/2]*Sin[u] - Sin[v/2]*Sin[2 u])*Sin[v], Sin[v/2]*Sin[u] + Cos[v/2]*Sin[2 u]}, {u, -P...
{}
{'log_upvote_score': 5, 'links': ['https://mathematica.stackexchange.com/questions/50941', 'https://mathematica.stackexchange.com', 'https://mathematica.stackexchange.com/users/9851/']}
jdg_69881
stackexchange
llm_judgeable_groundtruth_similarity
35670229
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: If I have a string, say, "The quick brown fox jumps over the lazy dog" , and there's a list [1, 8, 14, 18, 27] indicates where to cut the string. What I expect to get is a li...
Here's how I would do it: >>> s = "The quick brown fox jumps over the lazy dog">>> l = [1, 8, 14, 18, 27]>>> l = [0] + l + [len(s)]>>> [s[x:y] for x,y in zip(l, l[1:])]['T', 'he quic', 'k brow', 'n fo', 'x jumps o', 'ver the lazy dog'] Some explanation: I'am adding 0 to the front and len(s) to the end of the list, such...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/35670229', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/5215536/']}
jdg_69882
stackexchange
llm_judgeable_groundtruth_similarity
1345890
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: I've seen a few questions posted before about mine, but this is a bit different. The original form of the question can be found here: http://librarun.org/book/10452/159 ...
If it is not true that "for every $\epsilon > 0$ there is some $\delta > 0$ such that if $0 < |x-a| < \delta$ then $|f(x) - L| < \epsilon$", then $$\color{blue}{\text{ there is some } \epsilon > 0 \text{ such that for every }\delta > 0 \text{ there is some } x \text{ which satisfies } \\0 < |x - a| < \delta \text{ but ...
{}
{'log_upvote_score': 4, 'links': ['https://math.stackexchange.com/questions/1345890', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/211697/']}
jdg_69883
stackexchange
llm_judgeable_groundtruth_similarity
39680320
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I'm trying to use LLDB within Xcode 8 to debug very basic STL. I used to be able to print a vector like this: p myvector[0] to see whatever was in the first vector index. Now...
[] is an operator method on std::vector , so to print the expression you want, lldb would have to be able to call the [] method. The problem here is that the STL on OS X is aggressive about inlining everything it can, and not wasting space producing out of line copies of the same functions. That's great for optimized...
{}
{'log_upvote_score': 8, 'links': ['https://Stackoverflow.com/questions/39680320', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/57662/']}
jdg_69884
stackexchange
llm_judgeable_groundtruth_similarity
6865261
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I am creating an Outlook 2010 add-in and have added a context menu to my ribbon for idMso="contextMenuMailItem". On click, I would like to remove a category but in the click...
The following link might provide you with some insight: http://msdn.microsoft.com/en-us/library/ff863278.aspx The "context" of the control gives you the corresponding Outlook object that you are customizing (for example an Inspector object). From there you'll need to reference the context object's CurrentItem property...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/6865261', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/239837/']}
jdg_69885
stackexchange
llm_judgeable_groundtruth_similarity
743243
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: In a triangle $ABC$ $2a^2+4b^2+c^2=4ab+2ac$ then the numerical value of $cos B$ equals ? ($a,b,c$ are sides opposite to angles $A,B,C$) I tried to use cosine rule , but ...
$$2a^2+4b^2+c^2=4ab+2ac\iff (a-2b)^2+(a-c)^2=0$$ Now sum of squares of two real numbers is zero, so each must be individually zero.Hence $a=c=2b$. Then$$\cos B=\frac{a^2+c^2-b^2}{2ac}=\frac{4b^2+4b^2-b^2}{8b^2}=\frac{7}{8}.$$
{}
{'log_upvote_score': 4, 'links': ['https://math.stackexchange.com/questions/743243', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/86694/']}
jdg_69886
stackexchange
llm_judgeable_groundtruth_similarity
21236774
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: We currently have a page setup that has no filters/facet/queries applied. It is a listing of all content (using a pager). The filter query is something like *:* (anything fro...
Querying for *:* is also called a MatchAllDocsQuery . According to the SO question How are results ordered in solr in a "match all docs" query it will return the docs in the same order as they were stored in the index. Be aware that if you update an existing document, it get's deleted and recreated. As such it would ap...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/21236774', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1004232/']}
jdg_69887
stackexchange
llm_judgeable_groundtruth_similarity
15753102
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I am using the sqlalchemy package in python. I have an operation that takes some time to execute after I perform an autoload on an existing table. This causes the following e...
I think you are looking for something like this: from sqlalchemy import exc, eventfrom sqlalchemy.pool import Pool@event.listens_for(Pool, "checkout")def check_connection(dbapi_con, con_record, con_proxy): '''Listener for Pool checkout events that pings every connection before using. Implements pessimistic discon...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/15753102', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/668624/']}
jdg_69888
stackexchange
llm_judgeable_groundtruth_similarity
15873172
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: When i show the image its going to the left most position of the div. i know its not a good question but i unable to solve this so posted. Actually i am dynamically adding ht...
Finding articulation vertices is an application of DFS. In a nutshell, Apply DFS on a graph. Get the DFS tree. A node which is visited earlier is a "parent" of those nodes which are reached by it and visited later. If any child of a node does not have a path to any of the ancestors of its parent, it means that removing...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/15873172', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1926138/']}
jdg_69889
stackexchange
llm_judgeable_groundtruth_similarity
8106765
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I need to use strtok to read in a first and last name and seperate it. How can I store the names where I can use them idependently in two seperate char arrays? #include <stdi...
Here is my take at a reasonably simple tokenize helper that stores results in a dynamically growing array null-terminating the array keeps the input string safe (strtok modifies the input string, which is undefined behaviour on a literal char[], at least I think in C99) To make the code re-entrant, use the non-standard...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/8106765', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/271534/']}
jdg_69890
stackexchange
llm_judgeable_groundtruth_similarity
47803002
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I have something which is an awful lot like a list comprehension in Python, except that it shares mutable state between iterations. Is there any way to do it with a list comp...
Is there any way to do it with a list comprehension? What I'm looking for is something like this... batch = [??? for _ in xrange(n)] Sure, no problem: >>> x = 1>>> n = 5>>> [prev.append(f(prev[0])) or prev.pop(0) for prev in [[x]] for _ in xrange(n)][1, 18, 9, 22, 11] Note: This is a bad idea. (I pretty much only did t...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/47803002', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/44330/']}
jdg_69891
stackexchange
llm_judgeable_groundtruth_similarity
93549
Below is a question asked on the forum mathoverflow.net. Provide a good and informational response to it like a helpful human would. Question: It is easy to visualize some Morse functions on surfaces (such as the torus) via the height function, but this seemingly doesn't work for 3-manifolds. I am looking for an expl...
The Morse function on $(S^1)^3$ that gives the genus 3 Heegaard splitting (the standard one) is basically just a smoothed "distance from the 1-skeleton function". So if you think of $S^1$ as the unit circle in $\mathbb C$, then $$f : (S^1)^3 \to \mathbb R$$ is given by $$f(z_1,z_2,z_3) = |z_1-1|^2 + |z_2-1|^2 + |z_3-1|...
{}
{'log_upvote_score': 5, 'links': ['https://mathoverflow.net/questions/93549', 'https://mathoverflow.net', 'https://mathoverflow.net/users/12310/']}
jdg_69892
stackexchange
llm_judgeable_groundtruth_similarity
34296002
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I have a UIbutton created in code in an NSObject class which controls a game in a UIViewController class. The button works fine throughout most of the game, but at a certain ...
Take out self.nextButton.alpha = 0 to test this out, I believe that button events will not fire when alpha is zero. When it comes to animations, the actual object's alpha will get set to zero before the animation starts, and what you are seeing is like a rendered interactive screenshot of your view as it animates I...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/34296002', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/4727468/']}
jdg_69893
stackexchange
llm_judgeable_groundtruth_similarity
11773820
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I am using wysihtml5 wysiwyg editor. The problem is that image src attribute and link href attribute are stripped from html. At server I am already getting stripped html. How...
Try taking a look at the wysihtml5-x.x.x.js file you are referencing. They decided that they would only allow absolute URLs (in the name of guarding against XSS). The code below essentially allows you to take any value if you are comfortable with that trade off. Ctrl-F for "var attributeCheckMethods" and make the foll...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/11773820', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/737629/']}
jdg_69894
stackexchange
llm_judgeable_groundtruth_similarity
50992188
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I wish to get rid of a lot of my repo's old history, so I did a shallow clone to get the last 50 commits only: git clone --depth=50 https://my.repo That worked OK, but when I...
Here's what I ended up doing - it worked perfectly. Note that I was moving from my old host (Bitbucket) to my new one (Gitlab). My comments are above the commands: # First, shallow-clone the old repo to the depth we want to keepgit clone --depth=50 https://...@bitbucket.org/....git# Go into the directory of the clone...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/50992188', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/178757/']}
jdg_69895
stackexchange
llm_judgeable_groundtruth_similarity
972775
Below is a question asked on the forum math.stackexchange.com. Provide a good and informational response to it like a helpful human would. Question: Some time ago I asked How to find $\displaystyle{\int}_0^1\frac{\ln^3(1+x)\ln x}x\mathrm dx$ .Thanks to great effort of several MSE users, we now know that\begin{align}\...
I will be using the following results:$$2\sum^\infty_{n=1}\frac{H_n}{n^q}=(q+2)\zeta(q+1)-\sum^{q-2}_{j=1}\zeta(j+1)\zeta(q-j)\tag1$$$$\sum^\infty_{n=1}\frac{H_n}{n^22^n}=\zeta(3)-\frac{\pi^2}{12}\ln{2}\tag2$$$$\sum^\infty_{n=1}\frac{H_n}{n^32^n}={\rm Li}_4\left(\tfrac{1}{2}\right)+\frac{\pi^4}{720}-\frac{1}{8}\zeta(3)...
{}
{'log_upvote_score': 6, 'links': ['https://math.stackexchange.com/questions/972775', 'https://math.stackexchange.com', 'https://math.stackexchange.com/users/75621/']}
jdg_69896
stackexchange
llm_judgeable_groundtruth_similarity
21706436
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I have a class ( MyFacade ) that I injected parameter(s) with Ninject : class MyFacade{ IDemoInterface demo; public MyFacade(IDemoInterface demo) { this.demo ...
When setting up your bindings, you need to bind your dependencies. It is always better to setup your dependencies in your bindings, as opposed to doing a kernel.Get<T>() in a constructor. You are using IOC, so leverage the framework you are using to do the injection for you. In your second example binding, what you are...
{}
{'log_upvote_score': 6, 'links': ['https://Stackoverflow.com/questions/21706436', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/480700/']}
jdg_69897
stackexchange
llm_judgeable_groundtruth_similarity
58747303
Below is a question asked on the forum Stackoverflow.com. Provide a good and informational response to it like a helpful human would. Question: I want to Unit and e2e test my applications as much as possible and my goal is a coverage of 101%. Problem right now with my setup is, that the @Column decorator from typeorm...
I ran into a similar issue with GraphQL decorators. As all of these are functions, what you can do is create a file that holds all of the functions you'll be using, name them, and export them, so that you can actually test them as well and get the coverage with Jest. (The tests should literally be something like expect...
{}
{'log_upvote_score': 5, 'links': ['https://Stackoverflow.com/questions/58747303', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/2291097/']}
jdg_69898
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