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What does the star operator mean, in a function call?
What does the * operator mean in Python, such as in code like zip(*x) or f(**k) ?
5 Answers
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Getting only response header from HTTP POST using curl
...as moved to a different location (indicated with a Location: header and a 3XX response
code), this option will make curl redo the request on the new place. If used together with -i/--include or -I/--head, headers from all requested
pages will be shown. When authentication is used, ...
Adding placeholder text to textbox
I am looking for a way to add placeholder text to a textbox like you can with a textbox in html5.
24 Answers
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Can someone explain the traverse function in Haskell?
...its point. Since I come from an imperative background, can someone please explain it to me in terms of an imperative loop? Pseudo-code would be much appreciated. Thanks.
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Proper MIME type for OTF fonts
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Works for me in Chrome 22 and Firefox 15 (Mac), on both SVG and WOFF inlined fonts.
– Zeke
Oct 10 '12 at 6:59
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Haskell error parse error on input `='
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In GHCi 7.x or below, you need a let to define things in it.
Prelude> let f x = x * 2
Prelude> f 4
8
Starting from GHC 8.0.1, top-level bindings are supported in GHCi, so OP's code will work without change.
GHCi, version 8.0....
When should I use Struct vs. OpenStruct?
...nstance methods as would a class. A bunch of options for a function, for example, make sense in a hash; they're only loosely related. A name, email, and phone number needed by a function could be packaged together in a Struct or OpenStruct. If that name, email, and phone number needed methods to ...
Calculating moving average
...to use R to calculate the moving average over a series of values in a matrix. The normal R mailing list search hasn't been very helpful though. There doesn't seem to be a built-in function in R will allow me to calculate moving averages. Do any packages provide one? Or do I need to write my own?
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how does multiplication differ for NumPy Matrix vs Array classes?
The numpy docs recommend using array instead of matrix for working with matrices. However, unlike octave (which I was using till recently), * doesn't perform matrix multiplication, you need to use the function matrixmultipy(). I feel this makes the code very unreadable.
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arrayfun can be significantly slower than an explicit loop in matlab. Why?
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You can get the idea by running other versions of your code. Consider explicitly writing out the computations, instead of using a function in your loop
tic
Soln3 = ones(T, N);
for t = 1:T
for n = 1:N
Soln3(t, n) = 3*x(t, n)^2 + 2*x(t, n) - 1;
end
end
toc
Time to compute on my ...