Fill a matrix with another buy keep the original size

Hi,

I have a 5x5 matrix (for example) filled with zeroes and I just want to fill that matrix from the top with another one which has fewer rows, say 3x5. What is the most elegant way of doing it?

Thanks!

Answer 1

[Stephen23]

A = zeros(5,5);
B = rand(3,5);
A(1:size(B,1),:) = B

A = 5×5

0.6104 0.7423 0.9155 0.5919 0.5947 0.0101 0.6127 0.8947 0.6021 0.8645 0.3824 0.7586 0.2458 0.6549 0.9956 0 0 0 0 0 0 0 0 0 0

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

[Matt]

Thank you! That was as simple as this. I'm a bit rusty!