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Multi-file submission test

From an example on StackExchange.

\documentclass{article}
\usepackage{pgfplotstable}
\usepackage{amsmath}

\begin{document}

\pgfplotstableread[header=has colnames]{matrix.dat}\mytable
\pgfplotstabletypeset[
begin table=\begin{pmatrix},
end table=\end{pmatrix},
skip coltypes,
write to macro=\mymatrix,
typeset=false
]{\mytable}
$\mymatrix$

\end{document}

An example using a hidden data file. Use the optional button below to see the data.