how can i create only the Matrix index

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mohammed hussein
mohammed hussein 2017-11-7
评论： mohammed hussein 2017-11-7
Hi i would like to create two variable that represent the matrix index of any size of matrix for example if i have matrix
A=[(1,1) (1,2) (1,3);(2,1) (2,2) (2,3);(3,1) (3,2) (3,3)]
how can i create like the matrix A
thank you

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Walter Roberson
Walter Roberson 2017-11-7
The easiest way is
sparse(list_of_row_indices, list_of_corresponding_column_indices, list_of_corresponding_values)
You can full() the result afterwards.
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Walter Roberson
Walter Roberson 2017-11-7
[R,C] = ndgrid(1:size(YourMatrix,1), 1:size(YourMatrix,2));
A = idxMatrix = arrayfun(@(r,c) [r,c], R, C, 'uniform', 0);

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