find elements vector in a matrix

Hi,

I have a matrix A 3x1201 and a vector B 3 elements. (A and B can change size but B will alway have the size of A row's).

B contains the indexes of the column in A I am intrested in.

First element of B is the index of the first row in a

Second elemnt of B is the index of the second row in A.

Third elemnt in B is the index of the third row in A.

How do I store in a new vector?

I Attached A and B to the post.

Thank You everybody!

In short I have to store in a new vector the elements:

A[1,1118]

A[2,1124]

A[3,1132]

B =

        1118        1124        1132

Answer 1

[Stephen23]

Simply use sub2ind like this:

>> idx = sub2ind(size(psic_pos),1:size(psic_pos,1),loc);
>> vec = psic_pos(idx)
vec =
      0.99353       1.0201       1.1786

And checking (the 2nd row):

>> psic_pos(2,1124)
ans =
       1.0201

[Paul Rogers]

this is exactley what I was looking for.

Thanks man, you made my day!