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pgfplots - 条形图的十进制值

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pgfplots - 条形图的十进制值

我需要十进制值（它们在代码中，但在图中。它们以整数形式获取）作为条形上方的值。此外，x 轴图例重叠，所以我需要将其放在 2 行中。我的意思是每个 x 图例都放在两行中。例如，对于“总时间”，时间应该放在下一行

\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.8}
\usepackage{pgfplotstable}
\renewcommand*{\familydefault}{\sfdefault}
\usepackage{sfmath}
\begin{document}
\begin{tikzpicture}
  \centering
  \begin{axis}[
        ybar, axis on top,
        title={cb},
        height=8cm, width=15.5cm,
        bar width=0.35cm,
        ymajorgrids, tick align=inside,
        major grid style={draw=white},
        enlarge y limits={value=.1,upper},
        ymin=0, ymax=30,
        axis x line*=bottom,
        axis y line*=right,
        y axis line style={opacity=0},
        tickwidth=0pt,
        enlarge x limits=true,
        legend style={
            at={(0.5,0.6)},
            anchor=north,
            legend columns=-1,
            /tikz/every even column/.append style={column sep=0.5cm}
        },
        ylabel={Computational time ($\mu$ s )},
        symbolic x coords={
           ramesh india, ramu england, rama america, raman poland, ram ukrain, ramani nedherlands, total time},
       xtick=data,
       nodes near coords={
        \pgfmathprintnumber[precision=0]{\pgfplotspointmeta}
       }
    ]
    \addplot [draw=none, fill=blue!30] coordinates {
      (ramesh india,8)
      (ramu england, 1) 
      (rama america,5.5)
      (raman poland,0) 
      (ram ukrain,0) 
      (ramani nedherlands,2)
      (total time,16.5) };
   \addplot [draw=none,fill=red!30] coordinates {
    (ramesh india,8)
    (ramu england, 1) 
    (rama america,5)
    (raman poland,7.5) 
    (ram ukrain,3) 
    (ramani nedherlands,2)
    (total time,25.5) };
   \addplot [draw=none, fill=brown!30] coordinates {
    (ramesh india,8)
    (ramu england, 1) 
    (rama america,5)
    (raman poland,7.5) 
    (ram ukrain,3) 
    (ramani nedherlands,2)
    (total time,28.5) };
    \legend{C, M, P}
  \end{axis}
  \end{tikzpicture}
\end{document}

答案1

你\pgfmathprintnumber[precision=0]{\pgfplotspointmeta}说的是“打印这个数字时保留零个小数”。如果你说precision=1，你会得到一个小数。正如你所发现的，通过全部删除，你会得到相同的结果[precision=0]。

顺便说一句，如果您想要例如8.0而不是8，您将需要\pgfmathprintnumber[zerofill, precision=1]{\pgfplotspointmeta}，但似乎您并不想要那个。

关于 xticklabels，您可以添加xticklabel style={align=center}到选项中axis，然后\\在您想要换行的位置添加符号坐标。

我还将条形图做得更宽一些，以便为标签留出空间。

无关注释：\centering在 a 里面放 atikzpicture没有多大意义。 a 的大小tikzpicture由内容决定， 应该\centering在 之前\begin{tikzpicture}。

在此处输入图片描述

\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.8}
\usepackage{pgfplotstable}
\renewcommand*{\familydefault}{\sfdefault}
\usepackage{sfmath}
\begin{document}
\begin{tikzpicture}
  \begin{axis}[
        ybar, axis on top,
        title={cb},
        height=8cm, width=15.5cm,
        bar width=0.45cm, % <-- modified
        ymajorgrids, tick align=inside,
        major grid style={draw=white},
        enlarge y limits={value=.1,upper},
        ymin=0, ymax=30,
        axis x line*=bottom,
        axis y line*=right,
        y axis line style={opacity=0},
        tickwidth=0pt,
        enlarge x limits=true,
        xticklabel style={align=center}, % <-- added
        legend style={
            at={(0.5,0.6)},
            anchor=north,
            legend columns=-1,
            /tikz/every even column/.append style={column sep=0.5cm}
        },
        ylabel={Computational time ($\mu$ s )},
        symbolic x coords={
           ramesh\\india, ramu\\england, rama\\america, raman\\poland, ram\\ukrain, ramani\\nedherlands, total time},
       xtick=data,
       nodes near coords={
        \pgfmathprintnumber{\pgfplotspointmeta}
       }
    ]
    \addplot [draw=none, fill=blue!30] coordinates {
      (ramesh\\india,8)
      (ramu\\england, 1) 
      (rama\\america,5.5)
      (raman\\poland,0) 
      (ram\\ukrain,0) 
      (ramani\\nedherlands,2)
      (total time,16.5) };
   \addplot [draw=none,fill=red!30] coordinates {
    (ramesh\\india,8)
    (ramu\\england, 1) 
    (rama\\america,5)
    (raman\\poland,7.5) 
    (ram\\ukrain,3) 
    (ramani\\nedherlands,2)
    (total time,25.5) };
   \addplot [draw=none, fill=brown!30] coordinates {
    (ramesh\\india,8)
    (ramu\\england, 1) 
    (rama\\america,5)
    (raman\\poland,7.5) 
    (ram\\ukrain,3) 
    (ramani\\nedherlands,2)
    (total time,28.5) };

    \legend{C, M, P}
  \end{axis}
  \end{tikzpicture}
  
\end{document}

答案2

\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.8}
\usepackage{pgfplotstable}
\renewcommand*{\familydefault}{\sfdefault}
\usepackage{sfmath}
\begin{document}
\begin{tikzpicture}
  \centering
\begin{axis}[
    height=8cm, width=15.5cm,
    ybar=1mm, axis on top,
    title={cb},
    bar width=5mm,
    tick align=inside,
    enlarge y limits={value=.1,upper},
    ymin=0, ymax=30,
    axis x line*=bottom,
    axis y line*=right,
    enlarge x limits=true,
    legend style={
        at={(0.5,0.6)},
        anchor=north,
        legend columns=-1,
    /tikz/every even column/.append style={column sep=0.5cm}
    },
    ylabel={Computational time ($\mu$ s )},
    symbolic x coords={
       ramesh india, ramu england, rama america, raman poland, ram ukrain, ramani nedherlands, total time},
   xtick=data,
x tick label style = {rotate=30, anchor=east, yshift=-2ex,
                      align=right, font=\footnotesize},
   nodes near coords={
   \pgfmathprintnumber[fixed zerofill, precision=1] % <---
   {\pgfplotspointmeta}
   },
   nodes near coords style = {font=\footnotesize}
]
\addplot [draw=none, fill=blue!30] coordinates {
  (ramesh india,8)
  (ramu england, 1)
  (rama america,5.5)
  (raman poland,0)
  (ram ukrain,0)
  (ramani nedherlands,2)
  (total time,16.5) };
\addplot [draw=none,fill=red!30] coordinates {
(ramesh india,8)
(ramu england, 1)
(rama america,5)
(raman poland,7.5)
(ram ukrain,3)
(ramani nedherlands,2)
(total time,25.5) };
\addplot [draw=none, fill=brown!30] coordinates {
(ramesh india,8)
(ramu england, 1)
(rama america,5)
(raman poland,7.5)
(ram ukrain,3)
(ramani nedherlands,2)
(total time,28.5) };
\legend{C, M, P}
\end{axis}
  \end{tikzpicture}
\end{document}

生产：

在此处输入图片描述

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