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Re: cross combinations

by chas (Priest)
on Oct 29, 2005 at 02:31 UTC ( [id://503831]=note: print w/replies, xml ) Need Help??

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in reply to cross combinations

Just a remark: It has been discussed on PM in the past that the glob function will do most of the work in forming a cartesian product (I don't remember exactly where, though...) So, for example, 
@a=map {split //} glob "{1,2}{3,4}";
while(@a){$x=shift @a;$y=shift @a;print "{$x,$y} "};

[download]
and you can clearly write functions like "cross" by formatting the output to taste.
(Not that this is more efficient than other solutions presented...probably isn't.)
chas

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