select values from matrix

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]

Answer 1

[Fangjun Jiang]

loc=sub2ind(size(A),idx,1:size(A,2));
>> out=A(loc)
out =
     1     7     3     9     5