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until now, for me it was enough to make matrices that way:

\begin{align*}
  \begin{pmatrix}[cc|c]
    1 & 2 & 3 \\
    1 & 2 & 3 \\
  \end{pmatrix}
\end{align*}

with redifining the matrix env like this (see https://tex.stackexchange.com/questions/2233/whats-the-best-way-make-an-augmented-coefficient-matrix)

\makeatletter
\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{
    \hskip -\arraycolsep
    \let\@ifnextchar\new@ifnextchar
    \array{#1}
}
\makeatother

but now I need to use the gauss package (https://www.ctan.org/pkg/gauss) but I still need the ability to set some kind of formatting string (like the [cc|c]). (to be specific, I need this vertical line to separate some columns from some other columns)

Can anyone help me to port the above described workaround to the gauss package?

muzimuzhi Z
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atticus
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    Does this answer your question? How to typeset row operations on augmented matrix –  May 11 '20 at 13:16
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    Oh thanks, didn't saw this post. I'd very much prefer the way having some kind of "format string" since this is much more convenient to use (and I think it shouldn't be too diffcult to implement since you'd only have to pass down this option to the array env on which the gmatrix is built on top of (I'm just not that firm in writing plain tex macros). But as a quick fix I think this will serve. Nevertheless I'd still really appreciate the (in my opinion) more clean version with a "format string". – atticus May 11 '20 at 13:22
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    I read in older answers that it isn't possible with gmatrix. However, you could recur to TikZ to emulate the gauss package features and still have a customizable matrix. –  May 11 '20 at 13:24
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    Where do you have read this (because from what I know this should be possible, in the worst case you'd have to make the "format string" a must have (not an optional parameter)) – atticus May 11 '20 at 13:42
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    Here: https://tex.stackexchange.com/questions/370323/how-to-use-gauss-package-which-displays-as-below. With a bit of patience you could write your own alternative to gauss and most of TeX.SX users (not me) are Tikz lovers, so you will be helped if you ask. –  May 11 '20 at 13:48
  • Hm, well let's see how much I later want that kind of format string ^^ but right now I think I'm too lazy for this. Thanks for researching ;) (you might want to write an answer ;) – atticus May 11 '20 at 15:23

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