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Why are variables “i” and “j” used for counters?
... the mathematical sense) - it's used commonly as an index in sums or other set-based operations, and most likely has been used that way since before there were programming languages.
Bash script to receive and repass quoted parameters
...e c is the first character of the value of the IFS
variable. If IFS is unset, the parameters are separated by spaces. If
IFS is null, the parameters are joined without intervening separators.
$@ -- Expands to the positional parameters, starting from one. When
the expansion occurs within d...
Why use 'git rm' to remove a file instead of 'rm'?
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Good answer. I was able to use git reset --hard and then do a checkout of master to get out of detached head state because I knew I didn't have any uncommitted changes. If you haven't committed your changes you may want to do a git stash, but I'm relatively new ...
Boolean.hashCode()
... the hash codes for the components. If too small values are used in a hash set with a large number of buckets there's a risk of ending up with an uneven distribution of objects.
Do collisions matter? Booleans just have two different values anyway?
Maps can contain booleans together with other objec...
How to add color to Github's README.md file
I have a README.md file for my project underscore-cli , a pretty sweet tool for hacking JSON and JS on the command-line.
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Is it possible to create a multi-line string variable in a Makefile
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export ANNOUNCE_BODY only sets the variable inside rules - it doesn't allow referencing $$ANNOUNCE_BODY to define other variables.
– anatoly techtonik
Jun 15 '13 at 14:34
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Setting Curl's Timeout in PHP
I'm running a curl request on an eXist database through php. The dataset is very large, and as a result, the database consistently takes a long amount of time to return an XML response. To fix that, we set up a curl request, with what is supposed to be a long timeout.
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Longest line in a file
I'm looking for a simple way to find the length of the longest line in a file. Ideally, it would be a simple bash shell command instead of a script.
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Count number of rows within each group
I have a dataframe and I would like to count the number of rows within each group. I reguarly use the aggregate function to sum data as follows:
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