Alright gurus, here's something that's been stumping me. I've got the following arrays:

my @ControlMatrix = (
 [ 1, 2, 1, 0, 0, 1, 2, 1, 1, 2, 1 ], 
 [ 1, 1, 2, 0, 0, 1, 2, 2, 1, 1, 0 ], 
 [ 1, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0 ]
);
my @ControlNames = ('Label', 'Textbox', 'Button');

[download]

@ControlMatrix describes controls on a page, with the first dimension being the control (corresponding to the entries in @ControlNames) and the second dimension being the field requirements for the control. A 1 denotes a "required" field, a 2 denotes an "optional" field, and a 0 denotes a field not included on this control.

What I'd like to do is output a 2D array of all the possible permutations of optional fields for each control.

For example, for the first control this would output:

( [ 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1 ], 
  [ 1, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1 ],
  [ 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 1 ],
  [ 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1 ],
  [ 1, 1, 1, 0, 0, 1, 1, 1, 1, 0, 1 ],
  [ 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1 ],
  [ 1, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1 ],
  [ 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1 ] )

[download]

Anyone have an elegant way to do this?

Shayk

In reply to Permutation algorithm? by Shayk

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