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MongoDB Aggregation: How to get total records count?
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13 Answers
13
Active
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How can I implode an array while skipping empty array items?
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212
You can use array_filter():
If no callback is supplied, all entries of input equal to FALSE...
OS X Terminal Colors [closed]
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751
Here is a solution I've found to enable the global
terminal colors.
Edit your .bash_profile (si...
Pandas count(distinct) equivalent
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Example:
In [2]: table
Out[2]:
CLIENTCODE YEARMONTH
0 1 201301
1 1 201301
2 2 201301
3 1 201302
4 2 201302
5 2 201302
6 3 201302
In [3]: table.groupby('YEARMONTH').CLIENTCODE.nunique()
Out[3...
Static variables in member functions
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169
Since class A is a non-template class and A::foo() is a non-template function. There will be o...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
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111
To understand what mod_rewrite does you first need to understand how a web server works. A web...
binning data in python with scipy/numpy
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184
It's probably faster and easier to use numpy.digitize():
import numpy
data = numpy.random.ran...
Generate random password string with requirements in javascript
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18 Answers
18
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Running a cron job at 2:30 AM everyday
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541
crontab -e
add:
30 2 * * * /your/command
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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
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To quote from the data.table FAQ 1.11 What is the difference between X[Y] and merge(X, Y)?
X[Y] is a join, looking up X's rows using Y (or Y's key if it has one) as an index.
Y[X] is a join, looking up Y's rows using X (or X's key if it has one)
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