pgfplots 图在 x 值为 5 时停止

Question

我有一个简单的问题。我制作了下面的 pgfplot。但不知何故，所有函数都只显示 x 值为 5。当定义

[
width=10cm, height=7.5cm,
xmin=0, xmax=30,
ymin=0, ymax=100,
xlabel=Zeit / min,
ylabel= Temperatur / °C,
]

没有。有人知道这是什么原因吗？

\documentclass[paper=a4,12pt,version=last,landscape]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{color}

\begin{document}
\begin{tikzpicture}
\begin{axis}[
width=10cm, height=7.5cm,
xmin=0, xmax=30,
ymin=0, ymax=100,
xlabel=Zeit / min,
ylabel= Temperatur / °C,
]

\addplot+[
    no markers,
    ultra thick,
    color=red,
    ultra thick,
    %] coordinates{(0,85) (25,10)};
    ]{-3*x+80};

\addplot+[
    sharp plot, 
    no markers,
    color=blue,
    ultra thick,
    ]{-2.033*x+80};

\addplot+[ 
    no markers,
    color=magenta,
    ultra thick,
    ]{x^2};

\end{axis}
\end{tikzpicture}

\end{document}

Answer 1

包括domain=0:30。默认域是-5:5，因此您的图将停止在x=5。

\documentclass[paper=a4,12pt,version=last,landscape]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{pgfplots}
\usepackage{color}

\begin{document}
\begin{tikzpicture}
\begin{axis}[
width=10cm, height=7.5cm,
xmin=0, xmax=30,
ymin=0, ymax=100,
xlabel=Zeit / min,
ylabel= Temperatur / °C,
domain=0:30
]

\addplot+[
    no markers,
    ultra thick,
    color=red,
    ultra thick,
    %] coordinates{(0,85) (25,10)};
    ]{-3*x+80};

\addplot+[
    sharp plot,
    no markers,
    color=blue,
    ultra thick,
    ]{-2.033*x+80};

\addplot+[
    no markers,
    color=magenta,
    ultra thick,
    ]{x^2};

\end{axis}
\end{tikzpicture}

\end{document}