How to fill a preallocated matrix with function output?

Question

Michael 2014-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/138193-how-to-fill-a-preallocated-matrix-with-function-output

评论： Michael 2014-6-29

Hi there.

I've preallocated a zeros(10,4) matrix. I'm trying to store the result or "fill" each row with the output of another function (that I didn't write). The output of the function is a 1x4 array (i.e. [1 2 3 4]). I effectively want to replace each row with "ans" but I know that's just not cool.

I assume this is done by concatenation... However, the best I can do is add to the array... but there's still the 10x4 zeros below it. Is there a way to do it with indices/for loop? I'm up for whatever's easiest.

example:

A = zeros(10,4) and my 1x4 output = [1 2 3 4]

How would I replace A's first row with [1 2 3 4] without just "adding" to it?

Thanks!