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

Question

Laura Albers 2018-5-1

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https://ww2.mathworks.cn/matlabcentral/answers/398401-how-to-add-a-selection-of-elements-from-one-matrix-to-a-selection-of-elements-of-another-matrix

回答： Siyu Guo 2018-5-1

采纳的回答： Siyu Guo

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?

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Answer 1

Siyu Guo 2018-5-1

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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);