combining matrices
On 2011-04-21 07:03, Marten Winter wrote:
Heja, I hope someone is still there to help me: How can I somehow merge/combine matrices to get such a result: Matrix A A B x1 1 0 x2 1 1 Matrix B C D x3 1 0 x4 0 1 Resulting Matrix? A B C D x1 1 0 0 0 x2 1 1 0 0 x3 0 0 1 0 x4 0 0 0 1
If you don't need this very often or very general, then use mat <- diag(0,4) mat[1:2, 1:2] <- A mat[3:4, 3:4] <- B mat If you do need more flexibility, you could use the 'assist' package's function bdiag() which handles block-diagonal matrices: require(assist) mat <- bdiag(list(A,B)) Peter Ehlers
Does anyone see this probably obvious solution with R how to do this? Sorry if this question is silly...it's too hot here to think properly ;O) Thanks! cheers Marten