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Algorithm to calculate the number of divisors of a given number
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27 Answers
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Rank items in an array using Python/NumPy, without sorting array twice
...se slicing on the left-hand side in the last step:
array = numpy.array([4,2,7,1])
temp = array.argsort()
ranks = numpy.empty_like(temp)
ranks[temp] = numpy.arange(len(array))
This avoids sorting twice by inverting the permutation in the last step.
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How to fix the uninitialized constant Rake::DSL problem on Heroku?
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205
Put this in your Rakefile above require 'rake':
require 'rake/dsl_definition'
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Is there a common Java utility to break a list into batches?
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257
Check out Lists.partition(java.util.List, int) from Google Guava:
Returns consecutive su...
how does multiplication differ for NumPy Matrix vs Array classes?
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127
The main reason to avoid using the matrix class is that a) it's inherently 2-dimensional, and b...
Dynamically select data frame columns using $ and a character value
...s a reproducible example below:
# set seed for reproducibility
set.seed(123)
df <- data.frame( col1 = sample(5,10,repl=T) , col2 = sample(5,10,repl=T) , col3 = sample(5,10,repl=T) )
# We want to sort by 'col3' then by 'col1'
sort_list <- c("col3","col1")
# Use 'do.call' to call order. Se...
Multiple glibc libraries on a single host
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234
It is very possible to have multiple versions of glibc on the same system (we do that every da...
Enable 'xp_cmdshell' SQL Server
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answered Feb 27 '11 at 4:43
Pero P.Pero P.
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How to delete object from array inside foreach loop?
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234
foreach($array as $elementKey => $element) {
foreach($element as $valueKey => $value...
How do I exchange keys with values in a dictionary?
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Python 2:
res = dict((v,k) for k,v in a.iteritems())
Python 3 (thanks to @erik):
res = dict((v,k) for k,v in a.items())
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