pgfplot:调整图例样式并添加多条路径

pgfplot:调整图例样式并添加多条路径

我整天阅读pgfplots手册,但不幸的是我无法实现以下目标:

(1)legend style:使图例方程左对齐,并将矩形框修改为其他形状(或最好:删除矩形框)

(2)添加简单的虚线,我试图绘制路径,但它们并没有出现在我想要的位置:/例如从到x=7两条曲线的交点。

\documentclass[13pt,a4paper,headlines=6,headinclude=true]{scrartcl}
\usepackage{tikz,pgfplots}
\usepackage{amsmath,amssymb,stmaryrd}
\begin{document}

  \begin{tikzpicture}[scale=1]
      \begin{axis}[axis lines=middle,xmin=-5,xmax=16,ymin=2,ymax=299,
        extra x ticks={0,4,7},
        tick label style={font=\tiny}, 
        legend style={font=\tiny,legend pos=outer north east}
            ]
            \addplot+[no marks,blue,domain=0.2:10,samples=150, thick] {(x)^3 - 12*(x)^2 + 60*x+98};
        \addlegendentry{$C(x) = x^3 - 12x^2 + 60x+98$};
            \addplot+[no marks,red,domain=0.2:13,samples=150, thick] {3*(x)^2 - 24*x + 60};
            \addlegendentry{$MC(x)=3x^2 - 24x + 60$};
            \addplot+[no marks,orange,domain=0.2:13,samples=150, thick] {(x)^2 - 12*x + 60 + (98)/(x)};
            \addlegendentry{$AV(x)=x^2 - 12x + 60 + \frac{98}{x}$};
            \path[draw=gray, dashed] (4,2) -- (4,50); 
            \path[draw=gray, dashed] (10,-2) -- (10,50); 
      \end{axis}
    \end{tikzpicture}

\end{document}

在此处输入图片描述

如果您能提供进一步的意见,让这个看起来更美观,我将非常感激。非常感谢。

答案1

要移除方框,请使用draw=none;要将方程式向左对齐,请cells={anchor=west}使用

legend style={draw=none,font=\tiny,legend pos=outer north east,cells={anchor=west}}

此外,您需要添加`\pgfplotsset{compat=1.12}才能使用

\path[draw=gray, dashed] (10,-2) -- (10,50);

否则,你可能必须使用

\path[draw=gray, dashed] (axis cs:10,-2) -- (axis cs:10,50);

代码:

\documentclass[13pt,a4paper,headlines=6,headinclude=true]{scrartcl}
\usepackage{pgfplots}
\pgfplotsset{compat=1.12}
\begin{document}

  \begin{tikzpicture}[scale=1]
      \begin{axis}[axis lines=middle,xmin=-5,xmax=16,ymin=2,ymax=299,
        extra x ticks={0,4,7},
        tick label style={font=\tiny},
        legend style={draw=none,font=\tiny,legend pos=outer north east,cells={anchor=west}}
            ]
            \addplot+[no marks,blue,domain=0.2:10,samples=150, thick] {(x)^3 - 12*(x)^2 + 60*x+98};
        \addlegendentry{$C(x) = x^3 - 12x^2 + 60x+98$};
            \addplot+[no marks,red,domain=0.2:13,samples=150, thick] {3*(x)^2 - 24*x + 60};
            \addlegendentry{$MC(x)=3x^2 - 24x + 60$};
            \addplot+[no marks,orange,domain=0.2:13,samples=150, thick] {(x)^2 - 12*x + 60 + (98)/(x)};
            \addlegendentry{$AV(x)=x^2 - 12x + 60 + \frac{98}{x}$};
            \path[draw=gray, dashed] (4,2) -- (4,50);
            \path[draw=gray, dashed] (10,-2) -- (10,50);
      \end{axis}
    \end{tikzpicture}

\end{document}

在此处输入图片描述

要改变形状,请使用usetikzlibrary{shapes.geometric}(例如)然后

legend style={ellipse,fill=olive,font=\tiny,legend pos=outer north east,cells={anchor=west}}

给出(丑陋)

在此处输入图片描述

legend style={rounded corners,fill=olive!40,font=\tiny,legend pos=outer north east,cells={anchor=west}}

我们得到

在此处输入图片描述

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