Great minds think alike, eh? (But I think you
need to test your expressions ;-) Go to
http://www.jsoftware.com/jwiki/Essays/KenKen
and look about a third of the way down,
q #~ (8$15) -:"1 (+/"1 ,. +/"2) q{0,2^i.4
The initial effort in your previous msg is also
similar to my initial effort.
----- Original Message -----
From: Marshall Lochbaum <[email protected]>
Date: Monday, October 4, 2010 16:28
Subject: Re: [Jprogramming] Distinct Numbers in Rows and Columns
To: 'Programming forum' <[email protected]>
> Here's a funny--and much faster--one:
> p=.p:i.n
> *./"1 (*/p) = (*/"2 ,. */"1) q{p
>
> Actually, I suppose it is better to do it with addition, so
> p=.2^i.n
> *./"1 (+/p) = (+/"2 ,. +/"1) q{p
>
> Marshall
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Roger Hui
> Sent: Monday, October 04, 2010 6:41 PM
> To: Programming forum
> Subject: [Jprogramming] Distinct Numbers in Rows and Columns
>
> An interesting puzzle arising from the KenKen solver:
> q is an array with shape (m,n,n) and (,q) e. 1+i.n .
> Which items of q have 1+i.n in each row and in each column?
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