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Drop unused factor levels in a subsetted data frame
...columns in a dataframe, you can use:
subdf <- subset(df, numbers <= 3)
subdf[] <- lapply(subdf, function(x) if(is.factor(x)) factor(x) else x)
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Return JSON response from Flask view
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davidism
88.4k1717 gold badges279279 silver badges264264 bronze badges
answered Oct 26 '12 at 15:33
codegeekco...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
..., c) = 0
offsetof(struct foo, x) = 1
arr[0].x = 10
arr[1].x = 20
p0 = ffbff317
p1 = ffbff31c
Bus error
In both cases, the program is compiled with no extra options, just gcc packed.c -o packed.
(A program that uses a single struct rather than array doesn't reliably exhibit the problem, since the ...
Python SQL query string formatting
I'm trying to find the best way to format an sql query string. When I'm debugging
my application I'd like to log to file all the sql query strings, and it is
important that the string is properly formated.
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Using a bitmask in C#
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edited Jul 16 '10 at 3:35
answered Jul 16 '10 at 2:17
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Remove not alphanumeric characters from string
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answered Feb 20 '12 at 16:23
AD7sixAD7six
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Pandoc markdown page break
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136
It looks like pandoc markdown uses standard LaTeX tags for this purpose:
\newpage and \pagebre...
Passing a string with spaces as a function argument in bash
...claration is wrong.
myFunction()
{
echo "$1"
echo "$2"
echo "$3"
}
And like the others, it works for me as well. Tell us what version of shell you are using.
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How to import classes defined in __init__.py
...2
jfsjfs
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What's the purpose of git-mv?
...for git mv oldname newname (see this answer).
– Ajedi32
Jun 11 '14 at 21:28
6
Note that git mv is...