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Full Discussion: extracting information from lines, put them into arrays
Top Forums Programming extracting information from lines, put them into arrays Post 302476231 by jsmithstl on Wednesday 1st of December 2010 06:36:04 AM
Old 12-01-2010
Here's one way:

Code:
 
$ cat avg.pl
#!/usr/bin/perl
use strict;
my $line;
my $val;
my $school;
my $grades;
my $score;
my $total;
my $avg;
my $i;
open ( INFILE, "<avg.dat" ) or
   die "ERROR:  Unable to open file:  avg.dat" ;
while ($line = <INFILE>) {
   chomp $line;
   ($school,$grades) = split(' ', $line, 2);
   $i = 0;
   $total = 0;
   foreach $score (split(',', $grades)) {
      $i++;
      $total += $score;
   }
   $avg = $total/$i;
   printf "%s:  %.1f\n", $school, $avg;
}
close (INFILE);
exit;

Code:
 
$ cat avg.dat
Highschool 100, 123, 135
Middleschool 41, 67, 54
Elementary 76, 315, 384

$ ./avg.pl
Highschool:  119.3
Middleschool:  54.0
Elementary:  258.3

 

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LEARN ABOUT DEBIAN

gpiv_s-avg

GPIV_S-AVG(1)						      General Commands Manual						     GPIV_S-AVG(1)

NAME

       gpiv_s-avg - Spatial statistics of PIV data.

SYNOPSIS

       gpiv_s-avg [-h | --help] [-p | --print] [-s] [-no_s] [-v | --version] [filename] < stdin > stdout

DESCRIPTION

       gpiv_s-avg reports the spatial global mean velocities and variances in x and y-direction of a PIV data stream. Only input data of which the
       peak number is not equal to -1 are taken into account.

       The parameters read from the configuration resources (containing the key POST) may be overruled by the command line options,  as  explained
       below.

Options
       -h | --help
	      On-line help.

       -p | --print
	      Prints  parameters,  command  line  options and input and eventually filenames to stdout.  The output is identic of filename.par, in
	      case -f is used.

       -s     Subtracts the mean x-and y-particle displacements from the input data.

       -no_s  Suppresses subtracting the mean values from the input data.

       -v | --version
	      Prints version information on standard output, then exits successfully.

       [-z dx0 dy0]
	      zero offset of displacement or velocity estimators.

       filename
	      Input PIV file. Overrides stdin and stdout. The output will be written to filename.sa.piv. Parameters are stored in filename.par and
	      may be used for future use by including them in ./gpivrc.

       SEE ALSO
	      gpivtools

NOTES

AUTHOR

       Gerber Van der Graaf

BUGS

       The program has been tested for PIV data. So far, no bugs have been found.

								  8 November 2006						     GPIV_S-AVG(1)
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