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“声明函数”在组图中不起作用吗？

tag-icon • tag-icon pgfplots groupplots
“声明函数”在组图中不起作用吗？

考虑以下 MWE：

\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}\pgfplotsset{compat=1.13}
\usetikzlibrary{babel, calc, arrows.meta}
\usepgfplotslibrary{groupplots}
\begin{document}
\begin{tikzpicture}[
    ]
        \begin{groupplot}[
                group style = {group size = 1 by 2},
                width=15cm, height=4.5cm,
                xmin=0, xmax=100, 
                ymin=0, ymax=12,
                xlabel = {x},
                ylabel = {y},
                grid,
                declare function = {r1(\x)=2*\x/10 - \x/800*\x;},
                declare function = {r2(\x)=2*\x - \x/10*\x;},
            ]
            \nextgroupplot[
                % declare function = {r1(\x)=2*\x/10 - \x/800*\x;},
                % declare function = {r2(\x)=2*\x - \x/10*\x;},
            ]
            \addplot[ultra thick, red,  domain=0:10] {r2(x)};
            \addplot[thick, dotted, red,  domain=10:20, forget plot] {r2(x)};

            \nextgroupplot[
                % declare function = {r1(\x)=2*\x/10 - \x/800*\x;},
                % declare function = {r2(\x)=2*\x - \x/10*\x;},
            ]

            \addplot[ultra thick, cyan,  domain=0:80] {r1(x)};
            \addplot[thick, dotted, cyan,  domain=80:100, forget plot] {r1(x)};
        \end{groupplot}

\end{tikzpicture}
\end{document}

编译会失败

buggp.tex|18 error| Package pgfkeys Error: I do not know the key '/pgfplots/declare function', to which you passed 'r1(\x )=2*\x /10 - \x /800*\x ;', and I am going to ignore it. Perhaps you misspelled it.
[...]

但是，如果我将单独的函数定义移到\nextgroupplot上面的代码中（注释），它将正常工作，并输出正确的结果：

在此处输入图片描述

这是错误/功能groupplots还是我做错了什么？我想分享小组中所有图表的定义。

答案1

declare function/tikz我认为属于，所以/tikz/declare function有效。我还没有尝试弄清楚发生了什么，可能是groupplots环境没有显示/tikz。

顺便说一下，您只需要一个，可以在同一个函数中定义多个函数。或者，您可以在序言中使用\begin{tikzpicture}[declare function=..或。\tikzset{declare function=..

\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}\pgfplotsset{compat=1.13}
\usetikzlibrary{babel, calc, arrows.meta}
\usepgfplotslibrary{groupplots}
\begin{document}
\begin{tikzpicture}[
    ]
        \begin{groupplot}[
                group style = {group size = 1 by 2},
                width=15cm, height=4.5cm,
                xmin=0, xmax=100, 
                ymin=0, ymax=12,
                xlabel = {x},
                ylabel = {y},
                grid,
                /tikz/declare function = {
                  r1(\x)=2*\x/10 - \x/800*\x;
                  r2(\x)=2*\x - \x/10*\x;
                },
            ]
            \nextgroupplot
            \addplot[ultra thick, red,  domain=0:10] {r2(x)};
            \addplot[thick, dotted, red,  domain=10:20, forget plot] {r2(x)};

            \nextgroupplot    
            \addplot[ultra thick, cyan,  domain=0:80] {r1(x)};
            \addplot[thick, dotted, cyan,  domain=80:100, forget plot] {r1(x)};
        \end{groupplot}

\end{tikzpicture}
\end{document}

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