Vertical line in matrix using LaTeX

Question 1

I tried making a vertical line in a matrix and I found two workarounds:

\documentclass{article}\usepackage{amsmath}\makeatletter\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%  \hskip -\arraycolsep  \let\@ifnextchar\new@ifnextchar  \array{#1}}\makeatother\begin{document}\[  \begin{bmatrix}[cccc|c]   1 & 0 & 3 & -1 & 0 \\   0 & 1 & 1 & -1 & 0 \\   0 & 0 & 0 & 0 & 0 \\\end{bmatrix}\]\[\left(\begin{array}{cccc|c}1 & 0 & 3 & -1 & 0 \\0 & 1 & 1 & -1 & 0 \\0 & 0 & 0 & 0 & 0 \\\end{array}\right)\]\end{document}

But I wanted to use this on the following matrix:

\begin{pmatrix} -2 & 2 & -1 \\2 & -3 & 1 \\2& -1 & 1\end{pmatrix}

Also with zeros at the end of every line. But having a negative in very column doesn't seem to work.

Question 2

Sorry, but I don't understand your question. What hinders you from using it in yourpmatrix? It's just other values, but otherwise basically the same as yourbmatrix. And what do you mean with "But having a negative in very column doesn't seem to work"?

Question 3

Look that your macro is the same of Torbjørn T.tex.stackexchange.com/questions/33519/…

Question 4

Withnicematrix (≥ 7.4).

\documentclass{article}\usepackage{nicematrix}\NewDocumentEnvironment{MyMatrix}{}  {\begin{bNiceMatrix}[r,vlines=-1]}  {\end{bNiceMatrix}}\begin{document}\[\begin{MyMatrix}   1 & 0 & 3 & -1 & 0 \\   0 & 1 & 1 & -1 & 0 \\   0 & 0 & 0 & 0 & 0 \\\end{MyMatrix}\]\end{document}

Question 5

Withtabularray:

\documentclass{article}\usepackage{tabularray}% the next line adds +pmatrix, +bmatrix... environments, similar to pmatrix, bmatrix...% but they accept optionals arguments like tblr environment\UseTblrLibrary{amsmath} \begin{document}\[\begin{+pmatrix}[colspec={ccc|c}] -2 & 2 & -1 & 0\\2 & -3 & 1 & 0\\2& -1 & 1 & 0\end{+pmatrix}\]\end{document}

Question 6

Nice and easy one+1

Question 7

It is not very clear what doesn't seem to work from your question. You can surely use the same construction as in the code you provided. If the alignment in the presence of negative numbers is the problem, you can use right-aligned columns.

\documentclass{article}\usepackage{amsmath}\makeatletter\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%  \hskip -\arraycolsep  \let\@ifnextchar\new@ifnextchar  \array{#1}}\makeatother\begin{document}\[\begin{pmatrix}[ccc|c] -2 & 2 & -1 & 0\\2 & -3 & 1 & 0\\2& -1 & 1  & 0\end{pmatrix}\]\[\begin{pmatrix}[rrr|r] -2 & 2 & -1 & 0\\2 & -3 & 1 & 0\\2& -1 & 1  & 0\end{pmatrix}\]\end{document}

Question 8

Look that this macro is the same of Torbjørn T.tex.stackexchange.com/questions/33519/…

Question 9

@Sebastiano, that's probably where the OP has got it. I just used what was in his question.

Question 10

It was unusual for a new user to be able to create a complex macro. Best regards.

Question 11

You can usespalign package: see the blank spaces. The default matrices are with the rounded brackets.

\documentclass{article}\usepackage{spalign}  \begin{document}\spaligndelims{[}{]}\[\spalignaugmat{-2 2 -1 0; 2 -3 1 0; 2 -1, 1 0}\]\end{document}

F. Pantigny 52.4k4 gold badges60 silver badges99 bronze badges · Answer 1 · 2025-12-14 20:34:37Z

Withnicematrix (≥ 7.4).

\documentclass{article}\usepackage{nicematrix}\NewDocumentEnvironment{MyMatrix}{}  {\begin{bNiceMatrix}[r,vlines=-1]}  {\end{bNiceMatrix}}\begin{document}\[\begin{MyMatrix}   1 & 0 & 3 & -1 & 0 \\   0 & 1 & 1 & -1 & 0 \\   0 & 0 & 0 & 0 & 0 \\\end{MyMatrix}\]\end{document}

quark67 4,6031 gold badge15 silver badges19 bronze badges · Answer 2 · 2025-12-15 00:36:16Z

Withtabularray:

\documentclass{article}\usepackage{tabularray}% the next line adds +pmatrix, +bmatrix... environments, similar to pmatrix, bmatrix...% but they accept optionals arguments like tblr environment\UseTblrLibrary{amsmath} \begin{document}\[\begin{+pmatrix}[colspec={ccc|c}] -2 & 2 & -1 & 0\\2 & -3 & 1 & 0\\2& -1 & 1 & 0\end{+pmatrix}\]\end{document}

invictus 4,5201 gold badge3 silver badges18 bronze badges · Answer 3 · 2025-12-14 21:25:28Z

It is not very clear what doesn't seem to work from your question. You can surely use the same construction as in the code you provided. If the alignment in the presence of negative numbers is the problem, you can use right-aligned columns.

\documentclass{article}\usepackage{amsmath}\makeatletter\renewcommand*\env@matrix[1][*\c@MaxMatrixCols c]{%  \hskip -\arraycolsep  \let\@ifnextchar\new@ifnextchar  \array{#1}}\makeatother\begin{document}\[\begin{pmatrix}[ccc|c] -2 & 2 & -1 & 0\\2 & -3 & 1 & 0\\2& -1 & 1  & 0\end{pmatrix}\]\[\begin{pmatrix}[rrr|r] -2 & 2 & -1 & 0\\2 & -3 & 1 & 0\\2& -1 & 1  & 0\end{pmatrix}\]\end{document}

Look that this macro is the same of Torbjørn T.tex.stackexchange.com/questions/33519/…
@Sebastiano, that's probably where the OP has got it. I just used what was in his question.
It was unusual for a new user to be able to create a complex macro. Best regards.

Sebastiano 67.4k18 gold badges123 silver badges269 bronze badges · Answer 4 · 2025-12-15 14:14:57Z

You can usespalign package: see the blank spaces. The default matrices are with the rounded brackets.

\documentclass{article}\usepackage{spalign}  \begin{document}\spaligndelims{[}{]}\[\spalignaugmat{-2 2 -1 0; 2 -3 1 0; 2 -1, 1 0}\]\end{document}

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Vertical line in matrix using LaTeX

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