Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Re: Random Derangement Of An Array

by jacques (Priest)
on Jul 06, 2008 at 03:47 UTC ( #695780=note: print w/replies, xml ) Need Help??

in reply to Random Derangement Of An Array

sub fisher_yates_shuffle { my $deck = shift; # $deck is a reference to an array my $i = @$deck; while ($i--) { my $j = int rand ($i+1); @$deck[$i,$j] = @$deck[$j,$i]; } } my @list = (1..5); fisher_yates_shuffle( \@list ); print join ', ',@list;

Replies are listed 'Best First'.
Re^2: Random Derangement Of An Array
by Limbic~Region (Chancellor) on Jul 06, 2008 at 04:12 UTC
    Is this a modified Fisher-Yates shuffle? I am too tired to tell. If it isn't, then it won't work because a shuffle is not guaranteed to generate a derangement. If it is - please explain the modification.

    Cheers - L~R

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://695780]
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others wandering the Monastery: (9)
As of 2017-07-20 13:08 GMT
Find Nodes?
    Voting Booth?
    I came, I saw, I ...

    Results (301 votes). Check out past polls.