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

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]

Answer 1

[Star Strider]

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

.

[JOSUE PÁNCHEZ]

Thank you so much!!!!

[Star Strider]

As always, my pleasure!

.

Answer 2

[the cyclist]

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

[JOSUE PÁNCHEZ]

Thank you so much!