如何隐藏 tikz 图片中的图例

Question

我试图在以下tikzpicture代码中隐藏图例。但是，使用后every axis legend/.code={\let\addlegendentry\relax}，图片变得混乱。有人能帮我解决这个问题吗？

\documentclass[border=5mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\begin{document}

\begin{tikzpicture}

\begin{axis}[
   width=10cm,
   height=5cm,
   scale only axis,
   xmin=0.8, xmax=3.2,
   xtick={1,2,3},
   xmajorgrids,
   ymin=0, ymax=1,
   ylabel={$\phi$},
   ymajorgrids,
   axis lines*=left,
   legend style ={ at={(1.03,1)}, 
        anchor=north west, draw=black, 
        fill=white,align=left},
    cycle list name=black white,
    smooth,
    every axis legend/.code={\let\addlegendentry\relax},
]

   \addplot coordinates{
      (1,0.35)
      (2,0.41)
      (3,0.49) 
   };
   \addlegendentry{$S1$=2.5};

   \addplot coordinates{
      (1,0.32)
      (2,0.46)
      (3,0.61) 
   };
   \addlegendentry{$S2$=3.5};

   \addplot coordinates{
      (1,0.31)
      (2,0.46)
      (3,0.51) 
   };
   \addlegendentry{$S3$=4.0};

   \addplot coordinates{
      (1,0.20)
      (2,0.33)
      (3,0.58) 
    };
    \addlegendentry{$S4$=4.5};

   \addplot coordinates{
      (1,0.25)
      (2,0.42)
      (3,0.48) 
    };
    \addlegendentry{$S5$=5.0};

    \addplot coordinates{
      (1,0.32)
      (2,0.40)
      (3,0.58) 
    };
    \addlegendentry{$S6$=6.0};

   \end{axis}
\end{tikzpicture}%

\end{document}

这是上述代码的输出。

Answer 1

不要使用\relax，因为 会删除 的参数\addlegendentry{...}并导致它们被错误地设置为轴原点处的文本，而是\legend{}在环境末尾使用 (empty) axis。这会清空图例，因此不会在输出中排版。

我在这里简化了你的 MWE；将来，请只显示与你的问题相关的代码。

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.10}
\begin{document}
\begin{tikzpicture}
\begin{axis}
  \addplot {x};
  \addlegendentry{foo};
  \addplot {x^2};
  \addlegendentry{bar};
  \legend{}; % empty the legend so as not to print it
\end{axis}
\end{tikzpicture}
\end{document}