On 29.12.2023 11:20, andrei wrote: Hi andrei,
I successfully compile (by pdflatex) the file: But I get an error when compile this file with uncommented rows: ! Extra alignment tab has been changed to \cr. <recently read> \endtemplatel.28 &1&2 &1&2 &1&2 &1&2 &1&2 \\ ?
We are not a LaTeX help desk, this is a very strong exception! The explanation + "fix" can be found here [1]. So putting the line \setcounter{MaxMatrixCols}{12} right after the \usepackage{amsmath} line solves your issue.
Hilmar[1] https://www.overleaf.com/learn/latex/Errors/Extra_alignment_tab_has_been_changed_to_%5Ccr
-- sigfault
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