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How to swap keys and values in a hash
...
files = {
'Input.tm>x m>t' => 'Randy',
'Code.py' => 'Stan',
'Output.tm>x m>t' => 'Randy'
}
h = Hash.new{|h,k| h[k] = []} # Create hash that defaults unknown keys to empty an empty list
files.map {|k,v| h[v]<< k} #append each key to t...
How to drive C#, C++ or Java compiler to compute 1+2+3+…+1000 at compile time?
...ompiler features. This means that I am not allowed to write a program and em>x m>ecute it, but I should just write a program that could drive the compiler to compute this sum while compilation and print the result when compilation completes. As a hint, he told me that I may use generics and pre-processor...
What is the difference between '>' and a space in CSS selectors?
What's the point using this syntam>x m>
5 Answers
5
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How to em>x m>port plots from matplotlib with transparent background?
I am using matplotlib to make some graphs and unfortunately I cannot em>x m>port them without the white background.
2 Answers
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See what process is using a file in Mac OS m>X m>
...doing anything with it nothing shows up here. Or at least seemed to be my em>x m>perience. sudo fs_usage | grep musiclibrary showed nothing but sudo lsof | grep musiclibrary showed 3 processes accessing my musiclibrary database files.
– gman
Jan 2 at 10:09
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How is Perl's @INC constructed? (aka What are all the ways of affecting where Perl modules are searc
...g like this:
$ env -i perl -V
...
@INC:
/usr/lib/perl5/site_perl/5.18.0/m>x m>86_64-linum>x m>-thread-multi-ld
/usr/lib/perl5/site_perl/5.18.0
/usr/lib/perl5/5.18.0/m>x m>86_64-linum>x m>-thread-multi-ld
/usr/lib/perl5/5.18.0
.
Note . at the end; this is the current directory (which is not necessarily the sa...
Golang: How to pad a number with zeros when printing?
How can I print a number or make a string with zero padding to make it fim>x m>ed width?
6 Answers
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What does .SD stand for in data.table in R
... like "Subset of Data.table". There's no significance to the initial ".", em>x m>cept that it makes it even more unlikely that there will be a clash with a user-defined column name.
If this is your data.table:
DT = data.table(m>x m>=rep(c("a","b","c"),each=2), y=c(1,3), v=1:6)
setkey(DT, y)
DT
# m>x m> y v
# ...
Reading a delimited string into an array in Bash
... Both ways may fail if $line has globbing characters in it. mkdir m>x m> && cd m>x m> && touch A B C && line="*" arr=($line); echo ${#arr[@]} gives 3
– Tino
Nov 26 '14 at 0:25
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How do I increase the number of displayed lines of a Java stack trace dump?
......". These lines indicate that the remainder of the stack trace for this em>x m>ception matches the indicated number of frames from the bottom of the stack trace of the em>x m>ception that was caused by this em>x m>ception (the "enclosing" em>x m>ception).
This shorthand can greatly reduce the length of the output in ...