kronecker sum
On 11-06-05 9:36 AM, Lara Poplarski wrote:
Dear All, Could someone please suggest how to find the Kronecker sum of two 2x2 matrices, i.e. given two matrices: -A A a -a and -B B b -b I need: -A-B A B 0 a -a-B 0 B b 0 -A-b A 0 b a -a-b
Why not do it in the obvious way? A <- matrix1[1,2] a <- matrix1[2,1] B <- matrix2[1,2] b <- matrix2[2,1] matrix(c(-A-B,a,b,0, A,-a-B,0,b, B,0,-A-b,a, 0,B,A,-a-b), 4,4) Duncan Murdoch