How to add each column of matrix A with another matrix B?

Question

Hung Dao 2021-4-14

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/802446-how-to-add-each-column-of-matrix-a-with-another-matrix-b

评论： Hung Dao 2021-4-15

采纳的回答： the cyclist

Suppose

is a

column vector and

is a

matrix, then

, a

matrix.

Now, I have matrix

, each

is a

column vector. I would like to add each column in A, starting from the first column

, with matrix B and store the result matrix C. The resulting matrix C now has dimension

and looks like this

How should I do it in Matlab?

Thanks !

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

the cyclist 2021-4-14

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/802446-how-to-add-each-column-of-matrix-a-with-another-matrix-b#answer_675406

在 MATLAB Online 中打开

I think this does what you want:

% Input data
A = [1 20;
     3 40];
B = [5 6 7;
     8 9 10];
% Algorithm:
% (1) Permute A, transforming it from MxN matrix to Mx1xN.
% (2) Add it to B, using implicit expansion so that all columns are added.
% (3) Reshape so that slices in 3rd dimension are now side-by-side instead.
C = reshape(permute(A,[1 3 2]) + B, size(B,1),[])
C = 2×6
     6     7     8    25    26    27
    11    12    13    48    49    50