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How to randomize (or permute) a dataframe rowwise and columnwise?
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234
Given the R data.frame:
> df1
a b c
1 1 1 0
2 1 0 0
3 0 1 0
4 0 0 0
Shuffle row-wise:
&...
How to switch position of two items in a Python list?
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404
i = ['title', 'email', 'password2', 'password1', 'first_name',
'last_name', 'next', 'new...
How to test valid UUID/GUID?
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439
Currently, UUID's are as specified in RFC4122. An often neglected edge case is the NIL UUID, n...
What's the difference between “mod” and “remainder”?
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145
There is a difference between modulus and remainder. For example:
-21 mod 4 is 3 because -21 +...
MySQL IF NOT NULL, then display 1, else display 0
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214
Instead of COALESCE(a.addressid,0) AS addressexists, use CASE:
CASE WHEN a.addressid IS NOT NUL...
How to create a density plot in matplotlib?
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124
Sven has shown how to use the class gaussian_kde from Scipy, but you will notice that it doesn't...
Determine device (iPhone, iPod Touch) with iOS
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edited Sep 19 '14 at 23:36
calvinf
3,43833 gold badges2323 silver badges3838 bronze badges
ans...
Compare version numbers without using split function
...ming your inputs are strings, here's a working sample with the normal .NET 4-part version string:
static class Program
{
static void Main()
{
string v1 = "1.23.56.1487";
string v2 = "1.24.55.487";
var version1 = new Version(v1);
var version2 = new Version(v2...
How do I sort one vector based on values of another
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answered Oct 14 '09 at 21:47
Ian FellowsIan Fellows
16k1010 gold badges4444 silver badges6363 bronze badges
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