One of the problems with providing a data set that is apparently already sorted is that it's hard to prove that the solution can indeed sort (unless you change the actual sort in use):

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

my %colorhash = ( CCgray  =>  ["0","0","0"], 
                  CCwhite =>  ["1","0","0"], 
                  CCgrey  =>  ["0","2","0"], 
                  CCBlue  =>  ["0","0","3"], ); 

 print "Original order of data:\n\n";
foreach my $colorname (keys %colorhash) { 
    printf "For key %-7s : ",$colorname;
    for my $i (0.. $#{ $colorhash{$colorname} } ){ 
         print "element[", $i,"] = $colorhash{$colorname}[$i] "; 
    } 
    print "\n"; 
} 
print "\n\n";
my @light2dark = sort lightsort (keys %colorhash); 
my @dark2light = sort  darksort (keys %colorhash); 

print "Order, dark  is ",join(',',@dark2light), ".\n";
print "Order, light is ",join(',',@light2dark), ".\n";

sub darksort { 
    $colorhash{$b}[0] <=> $colorhash{$a}[0] or 
    $colorhash{$b}[1] <=> $colorhash{$a}[1] or 
    $colorhash{$b}[2] <=> $colorhash{$a}[2] 
} 

sub lightsort { 
    $colorhash{$a}[0] <=> $colorhash{$b}[0] or 
    $colorhash{$a}[1] <=> $colorhash{$b}[1] or 
    $colorhash{$a}[2] <=> $colorhash{$b}[2] 
}

[download]
And the results are:

C:\Code>perl color-sort.pl
Original order of data:

For key CCBlue  : element[0] = 0 element[1] = 0 element[2] = 3
For key CCgray  : element[0] = 0 element[1] = 0 element[2] = 0
For key CCgrey  : element[0] = 0 element[1] = 2 element[2] = 0
For key CCwhite : element[0] = 1 element[1] = 0 element[2] = 0


Order, dark  is CCwhite,CCgrey,CCBlue,CCgray.
Order, light is CCgray,CCBlue,CCgrey,CCwhite.

[download]
Update: cleaner logic

In reply to Re: how to sort hash of array by value by dwm042
in thread how to sort hash of array by value by Anonymous Monk

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