Append vector into zero matrix

Question

H Lange 2021-11-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1588959-append-vector-into-zero-matrix

评论： H Lange 2021-11-17

So I have a zero matrix where I wish to insert the same vector into each column of the matrix, but for each column it need to be displaced one row, so that the vectors 'start' in the diagonal of the matrix. For instance if we have the vector v = [v_1, v_2, v_3], the matrix should look as following:

How would you implement this?

So far I have written the following code (the matrix is a NxM matrix):

for i=1:N

for j=1:M

???

end

The loop also needs to work for other vectors that has more than 3 elements.

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Answer 1

Chunru 2021-11-17

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https://ww2.mathworks.cn/matlabcentral/answers/1588959-append-vector-into-zero-matrix#answer_833789

在 MATLAB Online 中打开

v = zeros(5, 3);
x = randn(3,1);
n = numel(x);
for i=1:size(v, 2)
    v(i-1+(1:n), i) = x;
end
v
v = 5×3
    1.0525         0         0
    1.3620    1.0525         0
    0.0952    1.3620    1.0525
         0    0.0952    1.3620
         0         0    0.0952