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创建带有序数 x 轴的条形图？

tag-icon • tag-icon tikz-pgf bar-chart
创建带有序数 x 轴的条形图？

我正在尝试创建一个条形图，其中 x 轴上的值不相关。我当前的代码如下：

\documentclass{article}
\beging{document}
\begin{figure}
\centering
     \begin{tikzpicture}
        \begin{axis}[ylabel=Similarity,
                    ybar]
            \addplot table[y=Pref, col sep=comma] {5_Results/evalresults.csv};
            \addplot table[y=Rec, col sep=comma] {5_Results/evalresults.csv};

        \end{axis}
    \end{tikzpicture}
    \caption{A bar chart of user and course similarity}
    \label{evalresultsbar}
\end{figure}
\end{document}

但是这会生成此图表。我不仅想删除 x 轴上的值，还想阻止条形图堆叠在一起。

我想要的输出看起来像由 Google 表格生成的这个图表： 在此处输入图片描述

evalresults.csv 的内容

Pref,Rec,label
0.00,14.29,a
0.00,16.67,a
0.00,16.67,a
0.00,20.00,a
0.00,20.00,a
0.00,25.00,a
0.00,33.33,a
0.00,33.33,a
0.00,33.33,a
0.00,50.00,a
0.00,50.00,a
0.00,50.00,a
0.00,50.00,a
0.00,50.00,a
0.00,60.00,a
0.00,60.00,a
0.00,60.00,a
33.33,25.00,a
33.33,25.00,a
33.33,33.33,a
33.33,33.33,a
33.33,60.00,a
33.33,60.00,a
33.33,66.67,a
33.33,75.00,a
33.33,75.00,a
33.33,75.00,a
33.33,80.00,a
33.33,80.00,a
33.33,100.00,a
66.67,75.00,a
66.67,80.00,a
66.67,100.00,a
66.67,100.00,a
66.67,100.00,a
66.67,100.00,a
100.00,100.00,a

答案1

您需要以某种方式指定 x 坐标，因此添加x expr=\coordindex的选项table，如下所示。

我在代码中添加了一些注释

在此处输入图片描述

\documentclass[border=5mm]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.14}
\usepackage{pgfplotstable} % for pgfplotstableread, but you can use the filename in the \addplot as you did instead
\pgfplotstableread[col sep=comma]{
Pref,Rec,label
0.00,14.29,a
0.00,16.67,a
0.00,16.67,a
0.00,20.00,a
0.00,20.00,a
0.00,25.00,a
0.00,33.33,a
0.00,33.33,a
0.00,33.33,a
0.00,50.00,a
0.00,50.00,a
0.00,50.00,a
0.00,50.00,a
0.00,50.00,a
0.00,60.00,a
0.00,60.00,a
0.00,60.00,a
33.33,25.00,a
33.33,25.00,a
33.33,33.33,a
33.33,33.33,a
33.33,60.00,a
33.33,60.00,a
33.33,66.67,a
33.33,75.00,a
33.33,75.00,a
33.33,75.00,a
33.33,80.00,a
33.33,80.00,a
33.33,100.00,a
66.67,75.00,a
66.67,80.00,a
66.67,100.00,a
66.67,100.00,a
66.67,100.00,a
66.67,100.00,a
100.00,100.00,a
}\data
\begin{document}    
\begin{tikzpicture}
\begin{axis}[
  ylabel=Similarity,
  ybar,
  % reduce bar width
  bar width=1pt,
  % to remove whitespace below bars
  ymin=0,
  % only want the x-axis on the bottom
  axis x line=bottom,
  % add some horizontal space between bars and axis limits
  enlarge x limits=0.05,
  % don't draw the ticks
  tick style={draw=none},
  % remove x ticks
  xtick=\empty,
  % enable grid
  grid=major,
  % don't draw the vertical lines for the y-axes
  every outer y axis line/.style={draw=none},
  %position legend outside the axis, top right
  legend pos=outer north east,
  % don't draw box around legend
  legend style={draw=none}
]
    \addplot [fill=red!50,draw=none] table[x expr=\coordindex,y=Pref, col sep=comma] {\data};
    \addplot [fill=blue!30,draw=none] table[x expr=\coordindex,y=Rec, col sep=comma] {\data};

   \addlegendentry{Pref}
   \addlegendentry{Rec}

\end{axis}
\end{tikzpicture}
\end{document}

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