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( #3333=superdoc: print w/replies, xml ) Need Help??
This does most of the work for you, but I've left some things for you to do:

<DATA>; my @prev_line; while ( <DATA> ) { my @this_line = split /[,\s]+/; shift @this_line; print join( ", ", map { "$this_line[$_]-$prev_line[$_]" } 0 .. $#t +his_line ), "\n" if @prev_line; @prev_line = @this_line; } __DATA__ date, val1, val2, val3, val4 1/2/2007, 1, 4, 5, 6 1/3/2007, 2, 5, 7, 10 1/5/2007, 5, 6, 8, 11

Output:

2-1, 5-4, 7-5, 10-6 5-2, 6-5, 8-7, 11-10

You may find this version easier to follow (using the same __DATA__ as earlier):

<DATA>; my @prev_line; while ( <DATA> ) { my @this_line = split /[,\s]+/; shift @this_line; if ( @prev_line ) { my @output; for ( 0 .. $#this_line ) { push @output, "$this_line[$_]-$prev_line[$_]"; } print join( ", ", @output ), "\n"; } @prev_line = @this_line; }

That leaves you with the job and handling the files.

I'm sure google will help, and there's always the Perl documentation.

update: omitted __DATA__ first time round
update^2: added second example


In reply to Re^2: performing calculation in cells in a file by FunkyMonk
in thread RE: performing calculation in cells in a file by gsaray101

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