This would seem like an easy problem, but I'm not finding it to be as easy as expected.
Briefly, I would like to take an array and shuffle its elements.
However, sort { int(rand(2))?1:-1 } doesn't do what I want, as the following program demonstrates: 
for $r (0..5000) {
  @a=sort { int(rand(2))?1:-1 } (0..9); 
  ($g)=grep($a$_==4,(0..9)); 
  $h{$g}++;
}
for $r (0..9) {print "$r $h{$r}\n";}
As you can see if you run this, the element originally in the fifth position has a much larger chance of staying put or of moving only slightly than it should if the list were truly randomly shuffled.
One thought I've had would be to start with a list of indices and randomly pick one at a time, something like: 
@b=(0..9); @a=();
while(@b) {$i=int(rand($#b+1)); push @a, splice(@b,$i,1);}
Unfortunately, this seems awfully slow.

In reply to Randomly sorted array by Anonymous Monk

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