How to add a selection of elements from one matrix to a selection of elements of another matrix?

Hello,

I have two matrices:

• Y, which is a 2462x220 matrix
• Y_dif, which has the same dimensions

Basicaly, I want to add a submatrix within Y_dif to a submatrix of Y. More specifically: For rows 505:560 and columns 46:50 in matrix Y I want to add element-wise the values in row 393:448 and columns 48:50 of matrix Y_dif.

Does someone know how to do this?

Answer 1

[Siyu Guo]

The sub-matrix in Y_dif is 56-by-3 and the destination sub-matrix in Y is 56-by-5. The sizes do not match, and the addition cannot be done. If the column 48:50 in Y_dif is a typo of 46:50, then simply: Y(505:560, 46:50) = Y(505:560, 46:50) + Y_dif(393:448, 46:50);