Add first row of matrix A to matrix B

How can i add first row of matrix A to matrix B

a= [10 20 30 ;

40 50 6; ]

b= [ 12 14 16;

18 22 46; ]

[Les Beckham]

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

Also, you should be aware that Matlab is case sensitive. So, if you want to "add first row of matrix A to matrix B", you first have to define A and B (not a and b).

Answer 1

[Max Alger-Meyer]

I'm not totally sure what you're asking specifically, so here are answers to all of the different possibilities of things I think you might mean.

A = [10 20 30; 40 50 6];
B = [12 14 16; 18 22 46];

Option 1: Replace first row of B with first row of A:

B(1,:) = A(1,:)

B = 2×3

10 20 30 18 22 46

Option 2: Add first row of A to the end of B without replacing any of B:

B = [12 14 16; 18 22 46];
B(3,:) = A(1,:)

B = 3×3

12 14 16 18 22 46 10 20 30

Option 3: Add first row of A to B without replacing any of B, and in doing show shift the rest of B down one row:

B = [12 14 16; 18 22 46];
B(2:3,:) = B;
B(1,:) = A(1,:)

B = 3×3

10 20 30 12 14 16 18 22 46