How do I create a matrix that expands with new column vectors added to it?

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Dorian Serafin 2020-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/506332-how-do-i-create-a-matrix-that-expands-with-new-column-vectors-added-to-it

编辑： Bhaskar R 2020-2-19

I have a for loop, at the end of each loop I get a column vector (always the same length). I would like to store that column in a matrix that keeps expanding.

So if my loop executes n times (the amount n isn't predetermined), at the end I would like to have a matrix with n columns. How do I do this?

I've looked up adding vectors to matrices, merging etc but couldn't find what I was looking for.

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Answer 1

Bhaskar R 2020-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/506332-how-do-i-create-a-matrix-that-expands-with-new-column-vectors-added-to-it#answer_416299

编辑：Bhaskar R 2020-2-19

% it is recommended to prellocate x before operation but in your case x is not predetermined so assign columns directly
n = 5;
for ii = 1:n
    x(:, ii) = rand(10, 1); % for each iteration the column will be added to x for n(here 5) time
end