[R] define matrix by outer?
Zhen Pang
nusbj at hotmail.com
Fri May 27 02:29:58 CEST 2005
Dear all,
I'd like to define a k by k matrix where the element is defined by
mn<-function(m,n) sum(choose(m,(m-0:m))*choose((k-m),(n-m+0:m)))
the mn function works fine for scalar m and n, however, it fails to define
the matrix by outer.
a<-outer(1:k,1:k,mn)
gives error message:
Error in outer(1:k, 1:k, mn) : dim<- : dims [product 64] do not match the
length of object [1]
In addition: Warning messages:
1: Numerical expression has 64 elements: only the first used in: 0:m
2: Numerical expression has 64 elements: only the first used in: 0:m
I can define this matrix by loop or some apply function, however, the outer
function should be the most straitforward way. How to deal with it? Thanks.
Regards,
Zhen
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