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Edit: I swapped \begin{aligned} &\ro{r_2+-1r_1}\\ &\end{aligned} with &\ro{r_2+-1r_1}\\ , added some linebreaks an now it looks quite well.

I am working on a python matrix editor(it's still WIP) which outputs matrix equations as LaTex. In this case I tried to calculate an inverse matrix. The matrices should align beneath one another, but the line continues beyond the document.

Screenshot of the LaTex document in Overleaf

I also tried adding linebreaks(\\and\newline) but it didn't turn out as I hoped. enter image description here

I want it to look something like this but better aligned.(This format doesn't always work, and causes a huge amount of warning/error messages)

enter image description here

\documentclass{article}
\usepackage{amsmath,mathtools}

\usepackage{nicefrac}

\newenvironment{sysmatrix}[1]
 {\left(\begin{array}{@{}#1@{}}}
 {\end{array}\right)}
\newcommand{\ro}[1]{%
  \xrightarrow{\mathmakebox[\rowidth]{#1}}%
}
\newlength{\rowidth}% row operation width
\AtBeginDocument{\setlength{\rowidth}{3em}}

\begin{document}

\begin{alignat*}{2}
\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
1 & 1 & -1 & -1 & 0 & 1 & 0 & 0 \\
1 & -1 & 1 & -1 & 0 & 0 & 1 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_2+-1r_1}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
1 & -1 & 1 & -1 & 0 & 0 & 1 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_3+-1r_1}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_2\leftrightarrow r_3}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_4+-1r_1}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & -2 & -2 & 0 & -1 & 0 & 0 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_4+-1r_2}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & -2 & 2 & 0 & 0 & -1 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_4+-1r_3}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_1+1/2r_2}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & 0 & 1 & 0 & \dfrac{\strut 1}{\strut 2} & 0 & \dfrac{\strut 1}{\strut 2} & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_1+1/2r_2}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & -1 & 1 & -1 & 0 & 0 & 1 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}
&\begin{aligned}
&\ro{r_1+1/2r_2}\\
&\end{aligned}
\begin{sysmatrix}{rrrr|rrrr}
1 & -2 & 1 & -2 & \dfrac{\strut -1}{\strut 2} & 0 & \dfrac{\strut 3}{\strut 2} & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}
\end{alignat*}
\end{document}

I'm still very new to LaTex and don't really know much about formating... I hope you can help me.

3
  • 1
    what is the intention of \begin{aligned} &\ro{r_2+-1r_1}\\ &\end{aligned} a single row, single column alignment can't do anything useful? Jan 3, 2021 at 22:53
  • And what does +- in r_2+-1r_1 and other places denote? "Plus/minus", maybe? If so, it would be better to write \pm.
    – Mico
    Jan 3, 2021 at 23:09
  • Thank you for the advice, it look better already
    – TheBaum
    Jan 4, 2021 at 11:36

1 Answer 1

2

Simplifying the markup, and squeezing the white space in the arrays, I also widened the text block.

enter image description here

\documentclass{article}
\usepackage{amsmath,mathtools}

\addtolength\oddsidemargin{-1cm}
\addtolength\textwidth{2cm}
\usepackage{nicefrac}

\newenvironment{sysmatrix}[1]
 {\setlength\arraycolsep{3pt}
\left(\begin{array}{@{}#1@{}}}
 {\end{array}\right)}
\newcommand{\ro}[1]{%
  \xrightarrow{\mathmakebox[\rowidth]{#1}}%
}
\newlength{\rowidth}% row operation width
\AtBeginDocument{\setlength{\rowidth}{3em}}
\begin{document}

\begin{alignat*}{2}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
1 & 1 & -1 & -1 & 0 & 1 & 0 & 0 \\
1 & -1 & 1 & -1 & 0 & 0 & 1 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}
&\ro{r_2+-1r_1}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
1 & -1 & 1 & -1 & 0 & 0 & 1 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}\\
\ro{r_3+-1r_1}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}
&\ro{r_2\leftrightarrow r_3}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
1 & -1 & -1 & 1 & 0 & 0 & 0 & 1 \\
\end{sysmatrix}\\
\ro{r_4+-1r_1}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & -2 & -2 & 0 & -1 & 0 & 0 & 1 \\
\end{sysmatrix}
&\ro{r_4+-1r_2}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & -2 & 2 & 0 & 0 & -1 & 1 \\
\end{sysmatrix}\\
\ro{r_4+-1r_3}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 1 & 1 & 1 & 1 & 0 & 0 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}
&\ro{r_1+1/2r_2}
&\begin{sysmatrix}{rrrr|rrrr}
1 & 0 & 1 & 0 & \dfrac{\strut 1}{\strut 2} & 0 & \dfrac{\strut 1}{\strut 2} & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}\\
\ro{r_1+1/2r_2}
&\begin{sysmatrix}{rrrr|rrrr}
1 & -1 & 1 & -1 & 0 & 0 & 1 & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}
&\ro{r_1+1/2r_2}
&\begin{sysmatrix}{rrrr|rrrr}
1 & -2 & 1 & -2 & \dfrac{\strut -1}{\strut 2} & 0 & \dfrac{\strut 3}{\strut 2} & 0 \\
0 & -2 & 0 & -2 & -1 & 0 & 1 & 0 \\
0 & 0 & -2 & -2 & -1 & 1 & 0 & 0 \\
0 & 0 & 0 & 4 & 1 & -1 & -1 & 1 \\
\end{sysmatrix}
\end{alignat*}
\end{document}
2
  • Thank you very much, this solved my main problem. I still got two little Problems. 1. If I use a lot more matrices, they continue beyond the bottom of the Page. I tried \pagebreak and \newpage but they don't work so well... 2. There is a blank page at the beginning of the document and I don't know how to remove it with LateX.
    – TheBaum
    Jan 4, 2021 at 11:43
  • \allowdisplaybreaks will allow page breaks. @TheBaum Jan 4, 2021 at 11:47

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