This problem interested me in the sense that the data could be stored as ordered pairs. I was curious if a function could be written to efficiently process these data as ordered pairs. I didn't worry as much about possible variable output, though if someone thinks of a way to use a map to generate the final output (so that output could handle arbitrary data ranges) I'd be curious.

My solution is:

#!/usr/bin/perl
use warnings;
use strict;

package main;

my %ranges = ();

while (<DATA>) {
    my ( $key, $initial_value, $final_value ) = split /\s+/, $_;
    push @{$ranges{$key}}, [ $initial_value, $final_value ];
}

my @headers = (1, 2, 3, 5, 7, 10, 11, 15, 20);

my @keys = ( 'A', 'B', 'C', 'D' );

my $value = sprintf "ID %2d %2d %2d %2d %2d %2d %2d %2d %2d\n", @heade
+rs;
print $value;

foreach my $k (@keys) {
    my @results = map { &in_range($k, $_) } @headers;
    $value = sprintf "%-2s %2d %2d %2d %2d %2d %2d %2d %2d %2d\n", $k,
+ @results;
    print $value;
}

sub in_range {
    my $letter = shift;
    my $test_value = shift;
    if ( defined( $ranges{$letter} )) {
        foreach my $ref ( @{$ranges{$letter}} ) {
            if (($ref->[0] <= $test_value) && 
                ($ref->[1] >= $test_value)) {
                return 1;
            }
        }
    }
    return 0;
}

__DATA__
A 1  2
A 7  10
A 15 20
B 3  5
B 11 15
C 5  10
D 10 20

[download]
and the output is:

~/perl/monks$ ./ranges.pl
ID  1  2  3  5  7 10 11 15 20
A   1  1  0  0  1  1  0  1  1
B   0  0  1  1  0  0  1  1  0
C   0  0  0  1  1  1  0  0  0
D   0  0  0  0  0  1  1  1  1

[download]

In reply to Re: construct a matrix by different intervals by dwm042
in thread construct a matrix by different intervals by mozart

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