How to find the value of a matrix in a specific position?

I have a matrix A with the positions (361x2) stored and i want to find the values of another matrix B in the specific positions ..how can i do it?

[Andrei Bobrov]

please show example

[abbxucy11]

I have this code here and i found the location of all the values from -180 to 180 and stored them using the save command. It saves the locations in a function named find_results that is a matrix 361x2.

or=flow.Orientation; ordeg=(180*or)/pi; ORIENT=round(ordeg)

for a= 180:-1:-180

   [i,j]=find(ORIENT==a)

end

save('test.mat','i','j')

Then, i have another matrix named magnitude and i want to find the values of each location that there is in the find_results matrix

Answer 1

[Adam]

sz = size( B );
idx = sub2ind( sz, A(:,1), A(:,2) );
res = B( idx );

Answer 2

[Stephen23]

You can use sub2ind:

 idx = sub2ind(size(B), A(:,1), A(:,2));
 out = B(idx);