#219 \pgfplots@stacked@diff undefined

[Henri Menke]

This is related to https://sourceforge.net/p/pgf/bugs/512/ but it's not clear whether this is a PGF or pgfplots bug. It definitely surfaced after the PGF 3.1 update. However, it can be easily fixed by just defining \pgfplots@stacked@diff.

% used PGFPlots v1.16
\documentclass[border=5pt]{standalone}
\usepackage{pgfplots}
    \pgfplotsset{compat=1.16}
    \makeatletter
%        \def\pgfplots@stacked@diff{}
    \makeatother
\usepackage{filecontents}
    \begin{filecontents*}{123.tsv}
        x     y
        0.9   NaN
        1     0.1
        1.2   0.2
    \end{filecontents*}
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
        unbounded coords=jump,
        stack plots=y,
    ]
        \addplot table {123.tsv};
        \addplot table {123.tsv};
    \end{axis}
\end{tikzpicture}
\end{document}

[Stefan Pinnow]

I have modified the above MWE a bit to exclude stuff that is not relevant.

I can confirm that this bug occurs (only), when the first coordinate is NaN (or filtered away).