[R] Combination that adds a value

From: Julio Rojas <jcredberry_at_ymail.com>
Date: Mon, 21 Mar 2011 04:08:50 -0700 (PDT)

Dear all, I have three vectors "x<-1:n", "y<-1:m" and "z<-2:(n+m)". I need to find all combinations of "x" and "y" that add up a given value of "z", e.g., for "z==3" the combinations will be "list(c(1,2),c(2,1))".

Thanks in advance for your help.

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