How do I sum a vector (row) to a matrix?

Question

JOSUE PÁNCHEZ 2021-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1587559-how-do-i-sum-a-vector-row-to-a-matrix

评论： Star Strider 2021-11-16

If I have

A=[1 0 0 1; 
  -1 0 1 1;
   1 1 1 1]
B=[1 2 2 1]

How do I add the vector B to the 1st row of A so I get:

A=[2 2 2 3; 
  -1 0 1 1;
   1 1 1 1]

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Answer 1

Star Strider 2021-11-16

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在 MATLAB Online 中打开

This involves a bit of indexing.

Note that the rest of ‘A’ is unchnaged, and onlly ‘A(1,:)’ is involved in the operation.

A=[1 0 0 1; 
  -1 0 1 1;
   1 1 1 1];
B=[1 2 2 1];
A(1,:) = A(1,:) + B
A = 3×4
     2     2     2     2
    -1     0     1     1
     1     1     1     1

.

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JOSUE PÁNCHEZ 2021-11-16

Thank you so much!!!!

Star Strider 2021-11-16

As always, my pleasure!

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Answer 2

the cyclist 2021-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1587559-how-do-i-sum-a-vector-row-to-a-matrix#answer_832314

编辑：the cyclist 2021-11-16

在 MATLAB Online 中打开

A=[1 0 0 1; 
  -1 0 1 1;
   1 1 1 1];
B=[1 2 2 1];
A(1,:) = A(1,: ) + B
A = 3×4
     2     2     2     2
    -1     0     1     1
     1     1     1     1