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Clang optimization levels
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157
I found this related question.
To sum it up, to find out about compiler optimization passes:
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How to sum all column values in multi-dimensional array?
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Chris JChris J
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Django datetime issues (default=datetime.now())
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618
it looks like datetime.now() is being evaluated when the model is defined, and not each time yo...
What's the difference between jquery.js and jquery.min.js?
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11 Answers
11
Active
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Combine two or more columns in a dataframe into a new column with a new name
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132
Use paste.
df$x <- paste(df$n,df$s)
df
# n s b x
# 1 2 aa TRUE 2 aa
# 2 3 bb...
How can I measure the actual memory usage of an application or process?
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Massif writes a dump of memory usage snapshots (e.g. massif.out.12345). These provide, (1) a timeline of memory usage, (2) for each snapshot, a record of where in your program memory was allocated. A great graphical tool for analyzing these files is massif-visualizer. But I found ms_print...
How can I get all the request headers in Django?
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140
According to the documentation request.META is a "standard Python dictionary containing all av...
Shell script to send email [duplicate]
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146
Yes it works fine and is commonly used:
$ echo "hello world" | mail -s "a subject" someone@so...