Finding values corresponding to row and column index of a matrix

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Hari krishnan
Hari krishnan 2020-5-31
回答： Thiago Henrique Gomes Lobato 2020-5-31
I have a matrix 'A'. I would like to find the elements in 'A', corresponding to the indices given in 'row_index' and 'col_index'.
The required output is shown as; 'out'
A = [1 12 23 19 1 13;
2 3 13 34 5 75;
5 22 45 5 1 94;
4 5 68 2 5 17;
2 4 34 11 13 92];
row_index = [4,5,5];
col_index = [3,4,5];
out = [68,11,13];

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采纳的回答

Thiago Henrique Gomes Lobato
Have a look at the sub2ind function:
A = [1 12 23 19 1 13;
2 3 13 34 5 75;
5 22 45 5 1 94;
4 5 68 2 5 17;
2 4 34 11 13 92];
row_index = [4,5,5];
col_index = [3,4,5];
ind = sub2ind(size(A),row_index,col_index);
A(ind)
ans =
68 11 13

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