![使用元将符号添加到条形图](https://linux22.com/image/361958/%E4%BD%BF%E7%94%A8%E5%85%83%E5%B0%86%E7%AC%A6%E5%8F%B7%E6%B7%BB%E5%8A%A0%E5%88%B0%E6%9D%A1%E5%BD%A2%E5%9B%BE.png)
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
。
\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}