substituting, indexing two matricies

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Dana
Dana 2011-12-14
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

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Andrei Bobrov
Andrei Bobrov 2011-12-14
t = B~=0
C = A
C(t) = B(t)
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Dana
Dana 2011-12-15
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

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