Positioning and aligning many many matrices

Question

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.

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

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)

\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.

Answer 1

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

\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}