Add first row of matrix A to matrix B

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Didi Lovato
Didi Lovato on 8 Mar 2022
Edited: Les Beckham on 8 Mar 2022
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; ]
  1 Comment
Les Beckham
Les Beckham on 8 Mar 2022
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).

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Answers (1)

Max Alger-Meyer
Max Alger-Meyer on 8 Mar 2022
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

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