detemine subtraction result

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Mohammad Golam Kibria
Hi, suppose I have two matrix A and B as follows:
A =
1 2 3
3 3 6
4 6 8
4 7 7
B =
2 2 3
2 3 6
4 6 2
4 7 2
I need the subtraction result of value of A from a particular value say 12 where value of B is 2. i.e 12 minus values of the positions : (1,1) (1,2)(2,1)(3,3)(4,3) are 11, 10,9,4,5 respectively.
is there any easy way to do this?

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Walter Roberson
Walter Roberson 2011-5-9
12 - A(B==2)

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