☰

Pgfplots 中缺少分号

tag-icon • tag-icon tikz-pgf pgfplots
Pgfplots 中缺少分号

我收到“Package tikz 错误：放弃此路径。您是否忘记了分号？”错误，但我没有看到任何缺少的分号，并且图表按预期显示。我想我只是对代码理解不够好，有人能帮我找出错误吗？

代码如下：

    \documentclass{report}

\usepackage{amsthm}
\usepackage{pgfplots} %Plots with tikz
\pgfplotsset{compat=newest}
\usepackage{float}

\begin{document}

\begin{figure}[H]
    \centering
    \begin{tikzpicture}
        \begin{axis}[
            height=8cm, width=8cm,
            axis y line=center, axis x line=center,
            ylabel={$ct$}, xlabel={$x^1$},
            every axis y label/.style={ at={(ticklabel* cs:1.05)},anchor=south,},
            every axis x label/.style={ at={(ticklabel* cs:1.05)},anchor=west,}, no marks, ticks={none}, xmin=-8,xmax=8,ymin=-8,ymax=8,
            legend style={at={(axis cs:8.3,4)},anchor=south west},
            ]

            \addplot[samples=100,blue,domain=-10:10] ( x , sqrt(1 + x^2) );
                \addlegendentry{$s^2 > 0$};
            \addplot[samples=100,red,domain=-10:10] (sqrt(1 + x^2) , x );
                \addlegendentry{$s^2 < 0$};
            \addplot[thick,domain=-10:10] {x};
            \addplot[thick,domain=-10:10] {-x};
                \addlegendentry{$s^2 = 0$};

            \addplot[samples=100,blue,domain=-10:10] ( x , sqrt(8 + x^2) );
            \addplot[samples=100,blue,domain=-10:10] ( x , sqrt(20 + x^2) );
            \addplot[samples=100,blue,domain=-10:10] ( x , sqrt(35 + x^2) );
            \addplot[samples=100,blue,domain=-10:10] ( x , sqrt(55 + x^2) );

            \addplot[samples=100,blue,domain=-10:10] ( x , -sqrt(1 + x^2) );
            \addplot[samples=100,blue,domain=-10:10] ( x , -sqrt(8 + x^2) );
            \addplot[samples=100,blue,domain=-10:10] ( x , -sqrt(20 + x^2) );
            \addplot[samples=100,blue,domain=-10:10] ( x , -sqrt(35 + x^2) );
            \addplot[samples=100,blue,domain=-10:10] ( x , -sqrt(55 + x^2) );


            \addplot[samples=100,red,domain=-10:10] (sqrt(8 + x^2) , x );
            \addplot[samples=100,red,domain=-10:10] (sqrt(20 + x^2) , x );
            \addplot[samples=100,red,domain=-10:10] (sqrt(35 + x^2) , x );
            \addplot[samples=100,red,domain=-10:10] (sqrt(55 + x^2) , x );

            \addplot[samples=100,red,domain=-10:10] (-sqrt(1 + x^2) , x );
            \addplot[samples=100,red,domain=-10:10] (-sqrt(8 + x^2) , x );
            \addplot[samples=100,red,domain=-10:10] (-sqrt(20 + x^2) , x );
            \addplot[samples=100,red,domain=-10:10] (-sqrt(35 + x^2) , x );
            \addplot[samples=100,red,domain=-10:10] (-sqrt(55 + x^2) , x );




            \draw [black, draw=black, fill=cyan, opacity=0.1] (0,0) -- (10,10) -- (-10,10) -- cycle;
            \draw [black, draw=black, fill=cyan, opacity=0.1] (0,0) -- (10,-10) -- (-10,-10) -- cycle;

            \draw [black, draw=black, fill=purple, opacity=0.1] (0,0) -- (-10,10) -- (-10,-10) -- cycle;
            \draw [black, draw=black, fill=purple, opacity=0.1] (0,0) -- (10,10) -- (10,-10) -- cycle;
        \end{axis}
    \end{tikzpicture}
\end{figure}


\end{document}

答案1

使用(x,y)语法时，必须注意内括号并保护它们。例如，对于第一个图，在第二个参数周围添加括号：

        \addplot[samples=100,blue,domain=-10:10] ( x , {sqrt(1 + x^2)} );

代替

        \addplot[samples=100,blue,domain=-10:10] ( x , sqrt(1 + x^2) );

引用文档：

<x expression>还要注意，由于完整的点表达式被圆括号包围，因此或的圆括号<y expression> 需要特别注意。您需要另外引入花括号才能使用圆括号：

相关内容