stray grave accent

[Ulrike Fischer]

In pgfplotscoordprocessing.code.tex there is a stray grave accent

\def\pgfplotsscanlinelength@nan@pendingwork@PREPARED{%
	\pgfplotsplothandlerappendjumpmarker`   %<--------------------- THERE
	%
	\let\pgfplotsscanlinelength@nan@pendingwork=\relax
}%

I don't think that ist harms, but it leads to missing character warnings (or errors with \tracinglostchars=3)

\documentclass{article}

\usepackage{pgfplots}
\pgfplotsset{compat=1.18}

\begin{document}
    \begin{tikzpicture}
        \begin{axis}
            \addplot3[contour gnuplot] {x};
        \end{axis}
    \end{tikzpicture}
\end{document}

PGFPlots: reading {test-nomgt_contourtmp0.table}
Missing character: There is no ` in font nullfont!
Missing character: There is no ` in font nullfont!
Missing character: There is no ` in font nullfont!
Missing character: There is no ` in font nullfont!

[Mo-Gul]

Good catch, do you want to provide a PR?

[Mo-Gul]

@muzimuzhi, talking about pings :)

Could you check this one, too? Please let me know if you or I provide a PR.

[Vasco Wild]

Hello, I think I found a similar Problem. Using this example from the pgfplots documentation:

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.18}
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
            title={$x \exp(-x^2-y^2)$},
            domain=-2:2,enlarge x limits,
            view={0}{90},
        ]
        \addplot3 [
            contour lua={number=14, labels=false},
            thick,
        ] {exp(-x^2-y^2)*x};
    \end{axis}
\end{tikzpicture}
\end{document}

You get 13 Warnings: "Missing character: There is no ` (U+0060) in font nullfont!"

And if you use this example:

\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.18}
\begin{document}
\begin{tikzpicture}
    \begin{axis}[
            title={$x \exp(-x^2-y^2)$},
            domain=-2:2,
            enlargelimits,
            view={0}{90},
        ]
        \addplot3 [
            contour lua={levels={-0.1,-0.2,-0.6}},
            thick,
        ] {exp(-x^2-y^2)*x};
    \end{axis}
\end{tikzpicture}
\end{document}

You also get one warning of that kind. I think there might be a mistake like the other one appending the levels.
Do you have any idea about that?

[Henri Menke]

The fix for this issue has not been released yet.
1.18.1...HEAD#diff-a2061d667b10e9dac9fd5eda463956568b270e3fc68c7b463aa28afe34e09192L3090

If you want to suppress the warning you have to use the latest Git version.

[Vasco Wild]

The fix for this issue has not been released yet. 1.18.1...HEAD#diff-a2061d667b10e9dac9fd5eda463956568b270e3fc68c7b463aa28afe34e09192L3090

If you want to suppress the warning you have to use the latest Git version.

Do you know, when it will be released?

[Henri Menke]

There are no concrete plans, but usually there is a release around Christmas.

[marko-pi]

I am still seeing this problem. I have checked my MiKTeX Console, and apparently the latest pgfplots version is 2021-06-06?