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Array construction in R, Perl, and Python
Ningyang Array construction in R, Perl, and Python R: data Perl: @data = (1, 2, 3) @data[2..3] %hash = (‘a’ =>; ‘b’) $hash{a} Python: data = [1, 2, 3, ‘a’, ‘b’, ‘c’] data[2:3] tuple = (1, 2, 3, ‘a’, ‘b’, https://buycbdproducts.com # immutable dict = {‘a’: ‘America’, ‘c’: ‘Canada’} dict[‘a’]
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Perl one liner executing a shell command on…
http://palawork.it/?charka=agenzia-matrimoniale-le-margherite&320=d9 Perl one liner executing a shell command on files. e.g. copy all *.c files to new names, *.R. perl -de ‘foreach (@ARGV) {($new = $_) =~ s/c$/R/; system(“cp $_ $new”);}’ *c
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Select random contents from a file Sort sort…
Select random contents from a file Sort sort -R infile | head -n 3000 Perl perl -n -e ‘print if (rand > 0.1)’ infile
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Perl Getopt Long The module check wrong argument…
Perl Getopt::Long. The module check wrong argument but does not check when no argument is provided. In order to check if there is no argument as well as wrong argument, check the argument also. GetOptions( ‘test=s’ => \$option_test ) or exit(1); defined($option_test) or die(“Missing argument -t”); http://www.perlmonks.org/?node_id=789974
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Perl resources Perl Training Australia Perl Tips http…
Perl resources Perl Training Australia – Perl Tips http://perltraining.com.au/tips/ Modern Perl http://onyxneon.com/books/modern_perl/modern_perl_letter.pdf
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Rename multiple files on Linux If you are…
Rename multiple files on Linux If you are lucky to have rename installed on your system, use it. Rename is a Perl program and can take Perl regular expression. rename ‘s/^comp/compare/’ *pdf Or copy the code below. http://www.perlmonks.org/?node_id=632437 #!/usr/bin/perl -w # # This script was developed by Robin Barker (Robin.Barker@npl.co.uk), # from Larry Wall’s original […]
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Save a Perl oneliner to a script perl…
Save a Perl oneliner to a script. perl -MO=Deparse -pe ‘s/(\d+)/localtime($1)/e’ http://stackoverflow.com/questions/2822525/how-can-i-convert-perl-one-liners-into-complete-scripts
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Remove the first line in Perl $first line…
Remove the first line in Perl $first_line = ; while () { do_something(); }
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The Minus File Again following the lead of…
The Minus File Again following the lead of the standard shell utilities, Perl’s open function treats a file whose name is a single minus, “-“, in a special way. If you open minus for reading, it really means to access the standard input. If you open minus for writing, it really means to access the […]
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Usage of perlpod Suggested by Damian Co …
Usage of perlpod Suggested by Damian Conway in Perl Best Practices. Name Usage Description Required arguments Options Exit status Diagnostics Configuration Dependencies Incompatibilities Bugs and limitations Author License and copyright Disclaimer of warranty