lookup table as a matrix instead of an array

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Aravin
Aravin 2012-8-9
I have a matrix square R which contains the relation ship (distances) between numbers. Elements in R is uint8 and the size is 256 x 256.
Let say I have two other matrix A and B of same size now. Now I want to generate Matrix C which is extracted from R. In other words, looking the values of A and B in R and putting them in C.
For example
C ( 5, 5 ) = R(A(5,5), B(5,5));
I can't do it using intlut as it is for any array. How can we do it if we have matrix ?

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Jan
Jan 2012-8-19
See sub2ind.
index = sub2ind(size(R), A(:), B(:));
C = reshape(R(index), size(A));

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