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Specifying rails version to use when creating a new application
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504
I found here an undocumented option to create a new application using an older version of Rail...
What does the constant 0.0039215689 represent?
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0.0039215689 is approximately equal to 1/255.
Seeing that this is OpenGL, performance is probably important. So it's probably safe to guess that this was done for performance reasons.
Multiplying by the reciprocal is faster than re...
Most efficient way to create a zero filled JavaScript array?
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582
ES6 introduces Array.prototype.fill. It can be used like this:
new Array(len).fill(0);
Not ...
how to mysqldump remote db from local machine
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250
As I haven't seen it at serverfault yet, and the answer is quite simple:
Change:
ssh -f -L331...
How to compare strings ignoring the case
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5 Answers
5
Active
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What does numpy.random.seed(0) do?
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598
np.random.seed(0) makes the random numbers predictable
>>> numpy.random.seed(0) ; nu...
Apply a function to every row of a matrix or a data frame
..., byrow=TRUE)
R> M
[,1] [,2]
[1,] 1 2
[2,] 3 4
[3,] 5 6
R> apply(M, 1, function(x) 2*x[1]+x[2])
[1] 4 10 16
R>
This takes a matrix and applies a (silly) function to each row. You pass extra arguments to the function as fourth, fifth, ... arguments to apply().
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