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What's quicker and better to determine if an array key exists in PHP?
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Geometric Mean: is there a built-in?
...ositive values.
gm_mean = function(x, na.rm=TRUE){
exp(sum(log(x[x > 0]), na.rm=na.rm) / length(x))
}
Thanks to @ben-bolker for noting the na.rm pass-through and @Gregor for making sure it works correctly.
I think some of the comments are related to a false-equivalency of NA values in the d...
Simple way to create matrix of random numbers
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Take a look at numpy.random.rand:
Docstring: rand(d0, d1, ..., dn)
Random values in a given shape.
Create an array of the given shape and propagate it with random
samples from a uniform distribution over [0, 1).
>>> import numpy as np
>>> np....
Turn a number into star rating display using jQuery and CSS
...tars, span.stars span {
display: block;
background: url(stars.png) 0 -16px repeat-x;
width: 80px;
height: 16px;
}
span.stars span {
background-position: 0 0;
}
Image
(source: ulmanen.fi)
Note: do NOT hotlink to the above image! Copy the file to your own server and u...
How to list the size of each file and directory and sort by descending size in Bash?
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answered Feb 7 '13 at 10:54
DeveloperDeveloper
20.6k1919 gold badges7272 silver badges114114 bronze badges
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Tetris-ing an array
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answered Jul 18 '10 at 13:05
starbluestarblue
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What to do about Eclipse's “No repository found containing: …” error messages?
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450
Quick answer
Go to Help → Install new software → Here uncheck “Contact all update sites d...
Comparing numbers in Bash
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answered Sep 7 '13 at 0:48
jordanmjordanm
25k44 gold badges5252 silver badges6363 bronze badges
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Why does parseInt(1/0, 19) return 18?
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The result of 1/0 is Infinity.
parseInt treats its first argument as a string which means first of all Infinity.toString() is called, producing the string "Infinity". So it works the same as if you asked it to convert "Infinity" in base 19 ...
How to normalize a NumPy array to within a certain range?
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140
audio /= np.max(np.abs(audio),axis=0)
image *= (255.0/image.max())
Using /= and *= allows you ...