☰

使用元将符号添加到条形图

tag-icon • tag-icon pgfplots symbols bar-chart
使用元将符号添加到条形图

我在 pgfplots 中使用 meta 时遇到了一些问题。我想在某些条形图上方添加星号以显示重要性。我从一个表格中绘制了条形图，并尝试将表格的一列指定为与 meta 相对应，但似乎不起作用，经过一番搜索，我找不到任何回答过这个问题的人……

查看底部的代码。如果您能提供一些帮助，我将不胜感激。

感谢您的时间。

\usepackage{graphicx}
\usepackage{pgfplots}
\usepackage{float}
\usepackage{tikz}
\usepackage{caption}
\begin{figure}[h]
\begin{subfigure}[b]{1\textwidth}
    \centering
        \begin{tikzpicture}[trim axis left, trim axis right]
\begin{axis}[
    legend pos=north west,
    xlabel= Monensin Treatment (hrs),
    ylabel= GAPDH Normalised Expression,
    bar width={1cm},
    ymin=0,
    ymax=8,
    title = {PENK Expression},
    width=12cm,
    height=6cm,
    ytick={0,0.5,1,1.5},
    ymin=0,
    ymax=1.5,
    xtick={1,2,3,4},
    xticklabels={%
        Ctrl,
        1,
        6,
        24
        },
    grid=none,
    ybar,  enlarge x limits={abs=1},
    ]

\addplot[
    fill=blue!25,
    draw=black,
    point meta=y,
    every node near coord/.style={inner ysep=5pt},
    error bars/.cd,
        y dir=both,
        y explicit,
        point meta=explicit symbolic,
] 
table [y error=error, point meta=meta] {
x   y       error    label  meta

1   1.0128   0.07    1 
2   0.371  0.055     2      ***
3   0.30   0.0941    3      
4   0.224  0.0348    4      
};
%\node [above, black, font=\Large] at (axis cs: 0.371) {$\ast$}
\draw ({rel axis cs:0,0}|-{axis cs:0,0}) -- ({rel axis cs:1,0}|-{axis cs:0,0});
\end{axis}
\end{tikzpicture}
\caption{}
\end{subfigure}
\\\vspace{0.5cm}
\begin{subfigure}[b]{1\textwidth}
    \centering
        \begin{tikzpicture}[trim axis left, trim axis right]
\begin{axis}[
    legend pos=north west,
    ylabel= Ct Mean,
    xlabel= Monensin Treatment (hrs),
    bar width={1cm},
    title = {GAPDH Control},
    width=12cm,
    height=6cm,
    ytick={0,10,20,30},
    ymin=0,
    ymax=30,
    xtick={1,2,3,4},
    xticklabels={%
        Ctrl,
        1,
        6,
        24
        },
    grid=none,
    ybar,  enlarge x limits={abs=1},
    ]

\addplot[
    fill=red!25,
    draw=black,
    point meta=y,
    every node near coord/.style={inner ysep=5pt},
    error bars/.cd,
        y dir=both,
        y explicit
] 
table [y error=error] {
x   y           error    label

1   20.45   4.152    1
2   23.54  0.368     2 
3   22.71   0.492    3
4   23.82  0.221     4
};

\draw ({rel axis cs:0,0}|-{axis cs:0,0}) -- ({rel axis cs:1,0}|-{axis cs:0,0});
\end{axis}
\end{tikzpicture}
\caption{}
\end{subfigure}
\label{fig:penkexpression}
\caption{}
\end{figure}

答案1

该代码实际上对您有效并且没有错误吗？

无论如何，您忽略的关键是nodes near coords。这个选项实际上可以在条形图上方打印元值。

更远：

  • 由于您想要打印一些非数字的内容，并且在表中提供，因此您需要添加point meta=explicit symbolic，就像您在第一个中所做的那样axis，但您不能将它放在之后/error bars/.cd。

  • 在\addplot table选项中，您需要提供meta=<column name>，而不是point meta=<column name>。

  • 我必须在列{}中的空白单元格中添加meta。

代码输出

\documentclass{article}
\usepackage{pgfplots}
\usepackage{subcaption}
\begin{document}
\begin{figure}
\begin{subfigure}[b]{1\textwidth}
    \centering
        \begin{tikzpicture}[trim axis left, trim axis right]
\begin{axis}[
    legend pos=north west,
    xlabel= Monensin Treatment (hrs),
    ylabel= GAPDH Normalised Expression,
    bar width={1cm},
    ymin=0,
    ymax=8,
    title = {PENK Expression},
    width=12cm,
    height=6cm,
    ytick={0,0.5,1,1.5},
    ymin=0,
    ymax=1.5,
    nodes near coords,
    xtick={1,2,3,4},
    xticklabels={%
        Ctrl,
        1,
        6,
        24
        },
    grid=none,
    ybar,  enlarge x limits={abs=1},
    ]

\addplot[
    fill=blue!25,
    draw=black,
    point meta=explicit symbolic,
    every node near coord/.style={inner ysep=5pt},
    error bars/.cd,
        y dir=both,
        y explicit,     
] 
table [y error=error,meta=meta] {
x   y       error    label  meta
1   1.0128   0.07    1      {}
2   0.371  0.055     2      ***
3   0.30   0.0941    3      {}  
4   0.224  0.0348    4      {}
};
%\node [above, black, font=\Large] at (axis cs: 0.371) {$\ast$}
\draw ({rel axis cs:0,0}|-{axis cs:0,0}) -- ({rel axis cs:1,0}|-{axis cs:0,0});
\end{axis}
\end{tikzpicture}
\caption{}
\end{subfigure}
\\[0.5cm]
\begin{subfigure}[b]{1\textwidth}
    \centering
        \begin{tikzpicture}[trim axis left, trim axis right]
\begin{axis}[
    legend pos=north west,
    ylabel= Ct Mean,
    xlabel= Monensin Treatment (hrs),
    bar width={1cm},
    title = {GAPDH Control},
    width=12cm,
    height=6cm,
    ytick={0,10,20,30},
    ymin=0,
    ymax=30,
    xtick={1,2,3,4},
    xticklabels={%
        Ctrl,
        1,
        6,
        24
        },
    grid=none,
    ybar,  enlarge x limits={abs=1},
    nodes near coords
    ]

\addplot[
    fill=red!25,
    draw=black,
    point meta=explicit symbolic,
    every node near coord/.style={inner ysep=5pt},
    error bars/.cd,
        y dir=both,
        y explicit
] 
table [y error=error,meta=label] {
x   y           error    label
1   20.45   4.152    1
2   23.54  0.368     2 
3   22.71   0.492    3
4   23.82  0.221     4
};

\draw ({rel axis cs:0,0}|-{axis cs:0,0}) -- ({rel axis cs:1,0}|-{axis cs:0,0});
\end{axis}
\end{tikzpicture}
\caption{}
\end{subfigure}
\label{fig:penkexpression}
\caption{}
\end{figure}
\end{document}

相关内容