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How to get a key in a JavaScript object by its value?
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How to calculate a logistic sigmoid function in Python?
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226
This should do it:
import math
def sigmoid(x):
return 1 / (1 + math.exp(-x))
And now you...
Is it possible for a computer to “learn” a regular expression by user-provided examples?
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Gumbo
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answered Mar 5 '09 at 20:18
Yuval FYuval F
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An efficient way to transpose a file in Bash
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How can I apply a function to every row/column of a matrix in MATLAB?
...on, one way to do it is to collect the rows or columns into cells using mat2cell or num2cell, then use cellfun to operate on the resulting cell array.
As an example, let's say you want to sum the columns of a matrix M. You can do this simply using sum:
M = magic(10); %# A 10-by-10 matrix...
Is there a way to include commas in CSV columns without breaking the formatting?
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Enclose the field in quotes, e.g.
field1_value,field2_value,"field 3,value",field4, etc...
See wikipedia.
Updated:
To encode a quote, use ", one double quote symbol in a field will be encoded as "", and the whole field will become """". So if you see the following in e.g. ...
Rails: Why does find(id) raise an exception in rails? [duplicate]
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Why do I need Transaction in Hibernate for read-only operations?
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answered Nov 24 '12 at 10:50
Stanislav BashkyrtsevStanislav Bashkyrtsev
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Is it better to use std::memcpy() or std::copy() in terms to performance?
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I'm going to go against the general wisdom here that std::copy will have a slight, almost impe...
How to round up to the nearest 10 (or 100 or X)?
...g10(x))
This actually also works when x is a vector:
> roundUp(c(0.0023, 3.99, 10, 1003))
[1] 1e-02 1e+01 1e+01 1e+04
..but if you want to round to a "nice" number, you first need to define what a "nice" number is. The following lets us define "nice" as a vector with nice base values from 1 ...