Fill a matrix with another buy keep the original size

Question

Matt 2023-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/1950823-fill-a-matrix-with-another-buy-keep-the-original-size

评论： Matt 2023-4-21

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!

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Answer 1

Stephen23 2023-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/1950823-fill-a-matrix-with-another-buy-keep-the-original-size#answer_1220183

编辑：Stephen23 2023-4-21

在 MATLAB Online 中打开

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