Re: Random 1-1 mapping


Clear questions and runnable code get the best and fastest answer
	PerlMonks

Re: Random 1-1 mapping

by Zaxo (Archbishop)

on May 28, 2006 at 18:10 UTC ( [id://552200]=note: print w/replies, xml )

Need Help??

in reply to Random 1-1 mapping

Since an array has the factorial of its element count possible orders, your $input must have that range to obtain a 1-1 relation. Are you sure that so stringent a requirement is needed?

Check out List::Util::shuffle(). It may be good enough for what you want.

You won't want to keep C++ comments in your perl, and prototypes are usually not desirable. See perltrap.

After Compline,
Zaxo

Comment on Re: Random 1-1 mapping

Replies are listed 'Best First'.

Re^2: Random 1-1 mapping
by tomazos (Deacon) on May 28, 2006 at 18:37 UTC

$input is just a scalar. It has the range 0..$max. I don't see where a factorial of the count comes in.

The idea is:

shuffle(42, 10, 0) == 6
shuffle(42, 10, 1) == 1
shuffle(42, 10, 2) == 5
shuffle(42, 10, 3) == 8
shuffle(42, 10, 4) == 3
shuffle(42, 10, 5) == 4
shuffle(42, 10, 6) == 9
shuffle(42, 10, 7) == 2
shuffle(42, 10, 8) == 7
shuffle(42, 10, 9) == 0
[download]

-Andrew.

[reply]
[d/l]

In Section Seekers of Perl Wisdom