substituting, indexing two matricies

Hello, I have a problem that I hope someone may be able to help me with. I will try to explain it best I can. Essentially i want to substitute values from one matrix into another.

I have matrix A and B and wish to create C

A=[ 2 5 7 ; 6 8 1 ; 3 6 4 ]

B=[ 0 2 0; 4 0 0 ; 8 0 0 ]

C=[ 2 2 7 ; 4 8 1 ; 8 6 4 ]

Matrix C is the same as matrix A except every value except the zeros from matrix B has been substitued into A to create C. I hope I have expleained this properly as I am struggling to find a solution.

I have tried a few methods including loops but have not been able to find a solution.

If anyone is able to help i would be very gratefull. Thanks

Regards Dana

Answer 1

[Andrei Bobrov]

t = B~=0
C = A
C(t) = B(t)

[Dana]

Haha. Thanks andrei. That is about a thousand times simpler than what i was trying to do. Briliant. Thanks for your help. You really saved me some time