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How to use GROUP BY to concatenate strings in SQL Server?
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18 Answers
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git remove merge commit from history
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101
Do git rebase -i <sha before the branches diverged> this will allow you to remove the me...
An efficient way to transpose a file in Bash
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115
awk '
{
for (i=1; i<=NF; i++) {
a[NR,i] = $i
}
}
NF>p { p = NF }
END {...
How to flatten only some dimensions of a numpy array
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129
Take a look at numpy.reshape .
>>> arr = numpy.zeros((50,100,25))
>>> arr.s...
Checkout subdirectories in Git?
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121
Sparse checkouts are now in Git 1.7.
Also see the question “Is it possible to do a sparse c...
List of zeros in python [duplicate]
...zeros? I want to be able to create a zeros list for each int in range(10)
8 Answers
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How to remove element from an array in JavaScript?
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12 Answers
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How do write IF ELSE statement in a MySQL query
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150
You probably want to use a CASE expression.
They look like this:
SELECT col1, col2, (case wh...
Should I use a data.frame or a matrix?
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177
Part of the answer is contained already in your question: You use data frames if columns (vari...