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#!/usr/bin/perl
use strict;
use warnings;
use utf8;
my ($file, $n) = @ARGV;
defined($file) or die "USAGE: $0 filename [set number]\n";
defined($n) or $n = -1;
my @data = loadData($file, $n);
printData(\@data);
sub printData
{
my ($a) = @_;
my $n = scalar(@$a);
for (my $i = 0; $i < $n; ++$i) {
print "$i ".$a->[$i]."\n";
}
}
sub loadData
{
my ($file, $n) = @_;
open(FILE, "<", "$file") or die "$0: Cannot open $file : $!\n";
my @temp;
my $counter = 0;
while (<FILE>) {
next unless (/RitzEigenvalues: index\=\d+\|/);
s/RitzEigenvalues: index=\d+\|//;
chomp;
@temp = split;
last if ($counter++ == $n);
}
close(FILE);
my $m = scalar(@temp);
die "$0: No /RitzEigenvalues found in $file\n" if ($m == 0);
return @temp;
}
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