具有正最小最大值的条形图

Question

我有这个用最小值（-ve）和最大值（+ve）绘制条形图的脚本

\documentclass[border=5mm]{standalone}

\usepackage{pgfplots}

\pgfplotstableread{
Year    FarMin  FarMax  NearMin NearMax HereMin HereMax
1930    -20     50      -10     30      -15     40
1940    -10     60      -15     60      -20     70
1950    -15     78      -20     20      -32     42
1960    -20     30      -15     40      -20     10
1970    -5      30      -30     40      -15     20
}\datatable


\begin{document}%
\begin{tikzpicture}
  \begin{axis}[
    x tick label style={
      /pgf/number format/1000 sep=},
      ylabel=Population,
      ybar,
      enlarge x limits=0.15,
      bar width=0.8em,
    after end axis/.append code={
        \draw ({rel axis cs:0,0}|-{axis cs:0,0}) -- ({rel axis cs:1,0}|-{axis cs:0,0});
    }
  ]
  \addplot +[forget plot] table {\datatable};
  \addplot table [y index=2] {\datatable};

  \addplot +[forget plot] table [y index=3] {\datatable};
  \addplot table [y index=4] {\datatable};

  \addplot +[forget plot] table [y index=5] {\datatable};
  \addplot table [y index=6] {\datatable};
  \legend{Far,Near,Here}
  \end{axis}
\end{tikzpicture}

\end{document}

但是，当我想要绘制一个具有正最小值的图形时，我得到的图形从零开始而不是给定的正值。

\documentclass[border=5mm]{standalone}

\usepackage{pgfplots}

\pgfplotstableread{
Year    FarMin  FarMax  NearMin NearMax HereMin HereMax
1930    20     50      10     30      15     40
1940    10     60      15     60      20     70
1950    15     78      20     20      32     42
1960    20     30      15     40      20     10
1970    5      30      30     40      15     20
}\datatable


\begin{document}%
\begin{tikzpicture}
  \begin{axis}[
    x tick label style={
      /pgf/number format/1000 sep=},
      ylabel=Population,
      ybar,
      enlarge x limits=0.15,
      bar width=0.8em,
    after end axis/.append code={
        \draw ({rel axis cs:0,0}|-{axis cs:0,0}) -- ({rel axis cs:1,0}|-{axis cs:0,0});
    }
  ]
  \addplot +[forget plot] table {\datatable};
  \addplot table [y index=2] {\datatable};

  \addplot +[forget plot] table [y index=3] {\datatable};
  \addplot table [y index=4] {\datatable};

  \addplot +[forget plot] table [y index=5] {\datatable};
  \addplot table [y index=6] {\datatable};
  \legend{Far,Near,Here}
  \end{axis}
\end{tikzpicture}

\end{document}

请帮我绘制带有正最小值的图表。谢谢！

Answer 1

仅作为一种解决方法：

\documentclass[border=5mm]{standalone}

\usepackage{pgfplotstable}
\usetikzlibrary{matrix}
\pgfplotsset{compat=1.14}

\pgfplotstableread{
Year    FarMin  FarMax  NearMin NearMax HereMin HereMax
1930    20     50      10     30      15     40
1940    10     60      15     60      20     70
1950    15     78      20     20      32     42
1960    20     30      15     40      20     10
1970    5      30      30     40      15     20
}\datatable


\begin{document}%
\begin{tikzpicture}
\pgfplotsset{
  every axis/.style={
    ybar stacked,
    enlarge x limits=0.15,
    bar width=6pt,
    ymin=0,ymax=80,
  },
  compat/bar nodes=1.8,
  minimum/.style={forget plot,draw=none,fill=none}
}

  \begin{axis}[
      x tick label style={/pgf/number format/1000 sep=},
      ylabel=Population,
      bar shift=-8pt
    ]
    \addplot [minimum] table {\datatable};
    \addplot table [y expr=\thisrowno{2}-\thisrowno{1}] {\datatable};
    \label{plot:Far}
  \end{axis}

  \begin{axis}[
      axis lines=none,
      bar shift=0pt,
      cycle list shift=1
    ]
    \addplot [minimum] table[y index=3] {\datatable};
    \addplot table [y expr=\thisrowno{4}-\thisrowno{3}] {\datatable};
    \label{plot:Near}
  \end{axis}

  \begin{axis}[
      axis lines=none,
      bar shift=8pt,
      cycle list shift=2
    ]
    \addplot [minimum] table[y index=5] {\datatable};
    \addplot table [y expr=\thisrowno{6}-\thisrowno{5}] {\datatable};
    \label{plot:Here}
  \end{axis}

  \matrix[
    matrix of nodes,
    draw,
    anchor=north east,
    nodes={inner ysep=.1em},
    column 1/.style={nodes={anchor=center}},
    column 2/.style={nodes={anchor=west}}
  ] at([shift={(-5pt,-5pt)}]current axis.north east)
  {
    \ref{plot:Far}&Far\\
    \ref{plot:Near}&Near\\
    \ref{plot:Here}&Here\\
  };
\end{tikzpicture}
\end{document}