Trying to learn how to run Gnuplot via a Perl script I came across the following helpful example:
#!/usr/bin/perl # Generate postscript and png plot with GNUplot from Perl # Author: Ioan Vancea # Usage: Give "data file" as an argument for script use strict; use warnings; my $file = ARGV[0]; # POSTSCRIPT open (GNUPLOT, "|gnuplot"); print GNUPLOT <<EOPLOT; set term post color "Courier" 12 set output "$file.ps" set size 1 ,1 set nokey set data style line set xlabel "frequency" font "Courier,14" set title "Fast Fourier Transform" font "Courier,14" set grid xtics ytics set xtics 100 plot "$file" using 1:2 w lines 1 EOPLOT close(GNUPLOT); A filehandle to run a program ?!! And what is that pipe symbol doing there? Would appreciate any pointers to how this works or where I can read up about this. TIA, Anjan -- ============================= anjan purkayastha, phd bioinformatics analyst whitehead institute for biomedical research nine cambridge center cambridge, ma 02142 purkayas [at] wi [dot] mit [dot] edu 703.740.6939
