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Hello, I would like to use sum command to compute sum. > A := Matrix(3, 2, {(1, 1) = 1, (1, 2) = 2, (2, 1) = 2, (2, 2) = 3, (3, 1) = 3, (3, 2) = 4}); > sum(A[k, 1], k = 1 .. 3); Error, bad index into Matrix Why it occures an error? If I use sum over list, it works. How can I sum members of 1st column of Matrix? Thanks Vladimir
matrix sum indexing

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