Conditional nodes near coords in pgfplots

Question

I have a matrix plot with nan meta values. Now I want to print only the nodes near coords which are not nan but somehow I cannot figure out how to do that.

Here is a MWE:

\documentclass[tikz, border=1cm]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{ifthen}
\pgfplotsset{width=7cm,compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[enlargelimits=false,
point meta rel=per plot, 
nodes near coords={%
    \ifthenelse{\expandafter\equal{\pgfmathprintnumber\pgfplotspointmeta}{NaN}}{}{\pgfmathprintnumber\pgfplotspointmeta}}]
\addplot [matrix plot,
point meta=explicit,
] coordinates {
(0,0) [0] (1,0) [1] (2,0) [2]
(0,1) [nan] (1,1) [nan] (2,1) [nan]
};
\end{axis}
\end{tikzpicture}
\end{document}

Thanks for any help!

You can probably test against the flag: https://tex.stackexchange.com/a/114310/47927 — Jasper Habicht, Nov 30 '23 at 17:19

score 1 · Accepted Answer · answered Nov 30 '23 at 17:30

Expanding on this great answer, you could text against the flag of the relevant value:

\documentclass[border=1cm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{width=7cm, compat=1.18}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
    enlargelimits=false,
    point meta rel=per plot, 
    nodes near coords={%
        \pgfmathfloatparsenumber{\pgfplotspointmeta}
        \pgfmathfloatgetflagstomacro\pgfmathresult\currentflags
        \ifnum\currentflags=3\else
            \pgfmathprintnumber\pgfplotspointmeta
        \fi
    }
]
\addplot[
    matrix plot,
    point meta=explicit,
] coordinates {
    (0,0) [0] (1,0) [1] (2,0) [2]
(0,1) [nan] (1,1) [nan] (2,1) [nan]

};
\end{axis}
\end{tikzpicture}
\end{document}

Conditional nodes near coords in pgfplots

1 Answers1