Go trough the file and remember what is the smallest and largest number in each column. Something like this (untested):

my $min_col_2 = 1_000_000; # Something large enough
my $max_col_2 = 0; # Something small enough

my $min_col_3 = 1_000_000; # Something large enough
my $max_col_3 = 0; # Something small enough

while(<>){
    if(/^ZZ/){
        my @array = split;
        if($min_col_2 > $array[1]){
            $min_col_2 = $array[1];
        }
        if($max_col_2 < $array[1]){
            $max_col_2 = $array[1];
        }
        # Snip
    }
}

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To get the step size you also have to remember the second smallest number, and look at the difference between that and the smallest when you are done.

In reply to Re: Find highest and lowest numerical values for columns in a file by lidden
in thread Find highest and lowest numerical values for columns in a file by vdb

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