How do i get the values of a 2D matrix based on column indices ?
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YI CHONG ONG
le 23 Sep 2020
Commenté : YI CHONG ONG
le 23 Sep 2020
I know this is a simple question, but I cant seem to find answers on this.
Given a 2D matrix of any size and a vector of indices, I want to index the elements in the matrix based on the column indices values in order.
Eg.
matrix = [1 2 3
4 5 6
7 8 9] column indices = [1,3,1]
Output = [1,6,7] -> column index 1 = 1, column index 3 = 6, column index 1 = 7
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madhan ravi
le 23 Sep 2020
Modifié(e) : madhan ravi
le 23 Sep 2020
Output = matrix(sub2ind(size(matrix), 1 : size(matrix, 1), column_indices))
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Ameer Hamza
le 23 Sep 2020
Use sub2ind()
matrix = [1 2 3
4 5 6
7 8 9];
cols = [1 3 1];
idx = sub2ind(size(matrix), 1:size(matrix, 1), cols);
matrix(idx)
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