Matrix operations

[Emma Zandi]

Hello,
Assume I have matrix A and B defined below, and I want to gain matrix C; consists of elements of matrix B divided by sum of elements of matrix B.
Given that my real matrices are a lot larger than this example, how can I make matrix C without having to have to do it one by one?

matrix A=(1\2\3\4)

matrix B=(7,8)

matrix C=(7/(1+2), 8/(3+4))

Thank you very much for your help,
Emma

[Scott Merryman]

Here is one way:

matrix A=(1\2\3\4)
matrix B=(7,8)
mat a = (1,1,0,0)'
mata : st_matrix("b", sort(st_matrix("a"), 1))
mat  A = ((a,b)'*A)'
mata: st_matrix("C", st_matrix("B") :/ st_matrix("A"))
matrix list C

[Andrew Musau]

No need to transpose matrices

matrix A=(1\2\3\4)
matrix B=(7,8)
mata: A = st_matrix("A")
mata: B = st_matrix("B")
mata: st_matrix("C",(B[1,1]/colsum(A[1::2]), B[1,2]/colsum(A[3::4])))