# pgfplots “Dimension too large” returned when plotting rational function

I've been using pgfplots for graphing for a while, now, and have recently run into a situation where I need to graph rational functions. Most of these have worked out fine, but one has caused me to get a "Dimension too large" error. Here is my code:

\documentclass{article}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
\begin{axis}[axis lines=middle, ymax=10, ymin=-10, xlabel=$x$, ylabel=$y$]
\addplot[only marks, scatter, scatter src=explicit, point meta=y] coordinates {
(-4, 4)
(-3, 5)
(-2, 10)
(-1, -5)
(0, 0)
(1, 1)
(2, 1.429)
};
\addplot[smooth, domain=-10:-1.5, variable=\x, samples=301, unbounded coords=jump, variable=\x] {(5 * \x) / (2 * \x + 3)};
\addplot[smooth, domain=-1.5:10, variable=\x, samples=301, unbounded coords=jump, variable=\x] {(5 * \x) / (2 * \x + 3)};
\addplot[dashed, domain=-10:10] {5 / 2};
\draw[dashed] ({axis cs:-1.5,0}|-{rel axis cs:0,0}) -- ({axis cs:-1.5,0}|-{rel axis cs:0,1});
\end{axis}
\end{tikzpicture}

\end{document}


This can be avoided by making the domains of the second and third plots restricted to -3:-1.5 and 1.5:3, respectively. I don't see how I would get too big a number, and can only imagine this being a decimal underflow issue. How can I fix this problem?

unbounded coords key works only you get a precise inf as a coordinate. However if the coordinate gets too big but not inf it tries to process that number and you get this error. In order to avoid such problems use restrict <x,y> to domain key

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{compat=1.10}

\begin{document}
\begin{tikzpicture}
\begin{axis}[axis lines=middle, ymax=10, ymin=-10, xlabel=$x$, ylabel=$y$,restrict y to domain=-10:10 ]
\addplot[only marks, scatter, scatter src=explicit, point meta=y] coordinates {
(-4, 4)
(-3, 5)
(-2, 10)
(-1, -5)
(0, 0)
(1, 1)
(2, 1.429)
};