EDIT: My bad. I mixed up @$array[$i,$j] with @$array[$i..$j] and misread your code. Yes, your code is functionally pretty much the same as mine, and yes, I did code a Fischer (sp?)-Yates shuffle.

I'd -- myself, but it doesn't let me :)
-------------------------------

The problem with that shuffle is it requires moving chunks of the array, quite inefficient with large arrays. A better linear shuffle is as follows: 

use strict;
use warnings;

my ($n, $t);
my @arr = (0,1,2,3,4,5,6,7,8,9);

for (0..($#arr-1)) {
    $n = int (rand() * ($#arr - $_ + 1)) + $_;
    $t = $arr[$n];
    $arr[$n] = $arr[$_];
    $arr[$_] = $t;
}

[download]
Which is equivalent to: 
For all items except last
    Pick random item between current item and last
    Swap that item with current item

[download]
I have an expanded version (not included here) which tests this with a large number of iterations and then counts how many of each number ends up in each slot, for purposes of analyzing the randomness of the sort. The results were within a percent or two of perfectly random.

In reply to Re: unsorted list by TedPride
in thread unsorted list by thekestrel

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