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PHP Regex to check date is in YYYY-MM-DD format
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23 Answers
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Why does 2 == [2] in JavaScript?
I recently discovered that 2 == [2] in JavaScript. As it turns out, this quirk has a couple of interesting consequences:
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Determining complexity for recursive functions (Big O notation)
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362
The time complexity, in Big O notation, for each function:
int recursiveFun1(int n)
{
if (n...
Big O, how do you calculate/approximate it?
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Regular expression that matches valid IPv6 addresses
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254
I was unable to get @Factor Mystic's answer to work with POSIX regular expressions, so I wrote...
Get operating system info
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202
The code below could explain in its own right, how http://thismachine.info/ is able to show wh...
How do I make a matrix from a list of vectors in R?
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124
One option is to use do.call():
> do.call(rbind, a)
[,1] [,2] [,3] [,4] [,5] [,6]
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What is the equivalent of MATLAB's repmat in NumPy
...gives a 3d output array as you would expect - matlab for some reason gives 2d output - but the content is the same).
Matlab:
>> repmat([1;1],[1,1,1])
ans =
1
1
Python:
In [46]: a = np.array([[1],[1]])
In [47]: np.tile(a, [1,1,1])
Out[47]:
array([[[1],
[1]]])
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