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  • $\begingroup$ Mathematica has already provided means to input a matrix. See e.g. reference.wolfram.com/language/howto/InputAMatrix.html $\endgroup$ Commented Sep 27, 2020 at 11:54
  • $\begingroup$ After you ask for the matrix size, you could present a TableView using the matrix size for the AllowedDimensions option. $\endgroup$ Commented Oct 27, 2020 at 15:03
  • $\begingroup$ Maybe one could used FormFunction, although it seem to be designed more for web applications. $\endgroup$ Commented Mar 26, 2021 at 18:07