Thank you grep and BrowserUk.
below is a replacement for my first foreach statement which works better than my original code thanks to the suggestion by grep.
my $f2 = $pos[1] - $pos[0];
my $f3 = $pos[2] - $pos[1];
my $f4 = $pos[3] - $pos[2];
my $f5 = $pos[4] - $pos[3];
foreach $line (@data) {
my $pictureline = "a$pos[0] a$f2 a$f3 a$f4 a$f5";
print unpack( $pictureline, $line ), "\n";
}
And thank you again BrowserUk for a more elegant solution altogether.
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