calling corresponding elements of two matrices

Hello,

I have a matrix A as shown below:

A = [1, 2, 3; -1 -5, -3; 0, -2, 4]

I also have the matrix B=A.^2 (elementwise squaring)

So I expect

B = [1 , 4, 9; 1, 25, 9; 0 , 4, 16]

I want to get the maximum element PER ROW of B, so

[M,I] = max(B, [], 2)

M will be a column matrix containing the maximum of each row, and I will be the positions/locations of these maximum.

I = [3, 2, 3]

Now, I want to use matrix I to refer to the counterparts in A. Meaning, I want to call the elements 3, -5, 4 and make them a column matrix. How should I do this?

Thanks

Answer 1

[Azzi Abdelmalek]

A = [1, 2, 3; -1 -5, -3; 0, -2, 4] 
B=A.^2
[M,ii] = max(B, [], 2)
out=A(sub2ind(size(A),1:size(ii,1),ii'))

[cgo]

thanks