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select values from matrix

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michael
michael on 12 Jan 2021
Answered: Fangjun Jiang on 12 Jan 2021
Hi,
I have a 2D matrix of size 2x360 and a vector of length 360 which contains values 1 or 2.
From the matrix, I'd like to select all the 360 values from selected row as defined in the vector.
How can I do that?
For example:
A= [ 1 2 3 4 5;
6 7 8 9 10]
idx = [1 2 1 2 1]
The result shall be [1 7 3 9 5]

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Accepted Answer

Fangjun Jiang
Fangjun Jiang on 12 Jan 2021
loc=sub2ind(size(A),idx,1:size(A,2));
>> out=A(loc)
out =
1 7 3 9 5

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