Fill a matrix with multido

Question

I would like to fulfill a matrix with multido (because I will have tons of matrices to write). I would like to do something like this but that does not work
documentclass[11pt]{article}
usepackage{amsmath,multido,ifthen}
begin{document}
$$begin{pMatrix}multido{i=1+1}{13}{%
multido{I=1+1}{7}{%
1ifthenelse{I<7}{&}{\}}}
end{pmatrix}$$
end{document}

If someone has a good idea...

F. Pantigny · Accepted Answer

You can use pAutoNiceMatrix of nicematrix to construct whatever matrix you want.
documentclass{article}
usepackage{nicematrix}
usepackage{ifthen}

begin{document}
[pAutoNiceMatrix{13-13}{ifthenelse{arabic{iRow}<arabic{jCol}}{1}{0}}]
end{document}

iRow is the LaTeX counter for the current row and jCol for the current column. They are defined by nicematrix.

Fill a matrix with multido

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