What is M(I) where M is a real matrix and I is a matrix of indices.

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David Epstein
David Epstein 2018-7-22
回答： Stephen23 2018-7-22
M is a 67x67 matrix of doubles. I is a 441x2 matrix, with I = [xc,yc]. Each row is a pair i,j of indices of M. I want to apply M to I and get a vector of 441 doubles. However, M(xc,yc) gives a matrix of size 441x441 and M([xc,yc]) gives a matrix of size 441x2. I think both results give only zeros. Does anyone know what is happening, as there is no error message? The only thing I can think of is to convert to linear indices. Is that the only way?

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Stephen23
Stephen23 2018-7-22
"The only thing I can think of is to convert to linear indices. Is that the only way?"
Yes. Use sub2ind.

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