I might create a matrix through a process, but I don't know its dimension beforehand. As far as I know, you can't define a matrix with some temporarily open size, right?
If so, what are some ideas to adjust for this issue?
One way is to define a matrix with sufficiently big size. Then afterwards trim by missing values or reduce the size based on some counter. For example, if you work out a matrix from other one, you allow the size based on the original matrix.
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