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Latex：两个条形图，相同的图例

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Latex：两个条形图，相同的图例

我有两个并排的条形图，并且它们共享相同的图例，我曾尝试使用\addlegendentry{}，但发现自己的图例重复了！

代码的输出

这是代码，我该怎么办（我尝试了网上的两种解决方案，但都没有用）：

\begin{figure*}[h!]
\begin{adjustbox}{center}
\pgfplotsset{width=0.93\textwidth,height=0.4\textheight,compat=1.16}
\begin{tikzpicture}
\begin{axis}[
   legend style={at={(0.5,-0.09)},
      anchor=north,legend columns=-1},
    symbolic x coords={Precision,Recall,F1-Score,Accuracy},
    major tick length=0cm,
    xtick=data,
    ymin=75.0,
     enlarge x limits=0.2,
    enlarge y limits={upper,value=0.2},
    nodes near coords,
    ybar,
    every node near coord/.append style={rotate=90, anchor=west},
    bar width = 8pt,
]

\addplot
coordinates {(Precision,86.6) (Recall,86.0) (F1-Score,86.3) (Accuracy,98.4)};
\addlegendentry{KNN}

\addplot
coordinates {(Precision,87.6) (Recall,86.2) (F1-Score,86.5) (Accuracy,97.5)};
\addlegendentry{Neural Networks}

\addplot
coordinates {(Precision,85.9) (Recall,86.3) (F1-Score,86.1) (Accuracy,98.6)};
\addlegendentry{Decision Tree}

\addplot
coordinates {(Precision,87.1) (Recall,86.8) (F1-Score,87.0) (Accuracy,99.2)};
\addlegendentry{Random Forest}

\addplot
coordinates {(Precision,85.5) (Recall,82.8) (F1-Score,83.7) (Accuracy,97.4)};
\addlegendentry{SVM}

\addplot
coordinates {(Precision,77.9) (Recall,77.7) (F1-Score,75.9) (Accuracy,87.8)};
\addlegendentry{Naive Bayes}

\end{axis}

\end{tikzpicture}% NO EMPTY LINE HERE!!!!
\begin{tikzpicture}

\begin{axis}[
   legend style={at={(0.5,-0.09)},
      anchor=north,legend columns=-1},
    symbolic x coords={FPR,FNR},
    major tick length=0cm,
    xtick=data,
    ymin=0.0,
    enlarge x limits=0.5,
    enlarge y limits={upper,value=0.2},
    nodes near coords,
    ybar,
    every node near coord/.append style={rotate=90, anchor=west},
    bar width = 15pt,
]

\addlegendentry{KNN}
\addplot
coordinates {(FPR,7.90) (FNR,14.0)};

\addlegendentry{Neural Networks}
\addplot
coordinates {(FPR,3.45) (FNR,13.75)};

\addlegendentry{Decision Tree}
\addplot
coordinates {(FPR,0.39) (FNR,13.63)};

\addlegendentry{Random Forest}
\addplot
coordinates {(FPR,0.31) (FNR,13.13)};

\addlegendentry{SVM}
\addplot
coordinates {(FPR,5.38) (FNR,17.11)};

\addlegendentry{Naive Bayes}
\addplot
coordinates {(FPR,3.63) (FNR,22.19)};

\end{axis}

\end{tikzpicture}
\end{adjustbox}
\caption{Left - No Interaction. Right - Interaction} \label{fig:M}
\end{figure*}

答案1

groupplots这是使用基于库的简化代码的提议

\documentclass[tikz]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{groupplots}

\pgfplotsset{compat=1.16}


\begin{document}
\begin{tikzpicture}
    \begin{groupplot}[group style={group size=2 by 1},width=12cm,height=8cm]
        \nextgroupplot[
            %legend style={at={(mygroup.south)},anchor=north,legend columns=-1},
            symbolic x coords={Precision,Recall,F1-Score,Accuracy},
            major tick length=0cm,
            xtick=data,
            ymin=75.0,
            enlarge x limits=0.2,
            enlarge y limits={upper,value=0.2},
            nodes near coords,
            ybar,
            every node near coord/.append style={rotate=90, anchor=west},
            bar width = 8pt,
        ]

        \addplot coordinates {(Precision,86.6) (Recall,86.0) (F1-Score,86.3) (Accuracy,98.4)};
        \addplot coordinates {(Precision,87.6) (Recall,86.2) (F1-Score,86.5) (Accuracy,97.5)};
        \addplot coordinates {(Precision,85.9) (Recall,86.3) (F1-Score,86.1) (Accuracy,98.6)};
        \addplot coordinates {(Precision,87.1) (Recall,86.8) (F1-Score,87.0) (Accuracy,99.2)};
        \addplot coordinates {(Precision,85.5) (Recall,82.8) (F1-Score,83.7) (Accuracy,97.4)};
        \addplot coordinates {(Precision,77.9) (Recall,77.7) (F1-Score,75.9) (Accuracy,87.8)};
        %\legend{KNN,Neural Networks,Decision Tree,Random Forest,SVM,Naive Bayes}

        \nextgroupplot[
            legend style={at={(-\pgfkeysvalueof{/pgfplots/group/horizontal sep}/2,-0.1)},
                    anchor=north,legend columns=-1},
            symbolic x coords={FPR,FNR},
            major tick length=0cm,
            xtick=data,
            ymin=0.0,
            enlarge x limits=0.5,
            enlarge y limits={upper,value=0.2},
            nodes near coords,
            ybar,
            every node near coord/.append style={rotate=90, anchor=west},
            bar width = 15pt,
        ]

        \addplot coordinates {(FPR,7.90) (FNR,14.0)};
        \addplot coordinates {(FPR,3.45) (FNR,13.75)};
        \addplot coordinates {(FPR,0.39) (FNR,13.63)};
        \addplot coordinates {(FPR,0.31) (FNR,13.13)};
        \addplot coordinates {(FPR,5.38) (FNR,17.11)};
        \addplot coordinates {(FPR,3.63) (FNR,22.19)};


        \legend{KNN,Neural Networks,Decision Tree,Random Forest,SVM,Naive Bayes}
    \end{groupplot}
\end{tikzpicture}

\end{document}

在此处输入图片描述

答案2

非常感谢先生回答我。我找到了一个简单的解决方案

\begin{figure*}[h!]
\begin{adjustbox}{center}
\pgfplotsset{width=0.93\textwidth,height=0.4\textheight,compat=1.16}
\begin{tikzpicture}   
\begin{axis}[
    legend columns=-1,
    legend entries={KNN, Neural Networks, Decision Tree, Random  Forest, SVM, Naive Bayes},
    legend to name=named,
    legend style={at={(0.5,-0.09)},
    anchor=north,legend columns=-1},
    symbolic x coords={Precision,Recall,F1-Score,Accuracy},
    major tick length=0cm,
    xtick=data,
    ymin=75.0,
     enlarge x limits=0.2,
    enlarge y limits={upper,value=0.2},
    nodes near coords,
    ybar,
    every node near coord/.append style={rotate=90, anchor=west},
    bar width = 8pt,
]

\addplot 
coordinates {(Precision,86.6) (Recall,86.0) (F1-Score,86.3) (Accuracy,98.4)};

\addplot        
coordinates {(Precision,87.6) (Recall,86.2) (F1-Score,86.5) (Accuracy,97.5)};

\addplot        
coordinates {(Precision,85.9) (Recall,86.3) (F1-Score,86.1) (Accuracy,98.6)};

\addplot        
coordinates {(Precision,87.1) (Recall,86.8) (F1-Score,87.0) (Accuracy,99.2)};

\addplot        
coordinates {(Precision,85.5) (Recall,82.8) (F1-Score,83.7) (Accuracy,97.4)};

\addplot        
coordinates {(Precision,77.9) (Recall,77.7) (F1-Score,75.9) (Accuracy,87.8)};

\end{axis}
\end{tikzpicture}% NO EMPTY LINE HERE!!!! 
\begin{tikzpicture}  
\begin{axis}[
    legend style={at={(0.5,-0.09)},
    anchor=north,legend columns=-1},
    symbolic x coords={FPR,FNR},
    major tick length=0cm,
    xtick=data,
    ymin=0.0,
    enlarge x limits=0.5,
    enlarge y limits={upper,value=0.2},
    nodes near coords,
    ybar,
    every node near coord/.append style={rotate=90, anchor=west},
    bar width = 15pt,
]

\addplot 
coordinates {(FPR,7.90) (FNR,14.0)}; 

\addplot        
coordinates {(FPR,3.45) (FNR,13.75)};

\addplot 
coordinates {(FPR,0.39) (FNR,13.63)}; 

\addplot        
coordinates {(FPR,0.31) (FNR,13.13)};

\addplot 
coordinates {(FPR,5.38) (FNR,17.11)}; 

\addplot        
coordinates {(FPR,3.63) (FNR,22.19)};

\end{axis}
\end{tikzpicture}
\end{adjustbox}

\ref{named}
\caption{Left - No Interaction. Right - Interaction}
\label{fig:M}
\end{figure*}

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