我尝试使用 a 中的变量\pgfplotsinvokeforeach作为路径名。我想在每次迭代中获取和#1。#1 + 1我无法让工作#1 + 1；它尝试使用我写的字面意思，而不是计算值。
\documentclass[11pt]{article}
\usepackage[top=2.54cm,bottom=2.54cm,left=2.75cm,right=2.75cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\pgfplotsset{compat=1.17}
\begin{filecontents}{data.txt}
0 10000
1 15000
2 10000
3 20000
4 5000
5 0
\end{filecontents}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}
\begin{axis} [
height = \axisdefaultheight,
width = \textwidth,
xlabel = Channel,
ylabel = Counts,
ymin = 0,
xmin = -5,
xmax = 132,
xtick pos = left,
axis on top,
]
% Vertical division of each Board [0-7]
\path (current axis.above origin) coordinate (T);
\pgfplotsinvokeforeach{0,...,8}{
\draw[draw=black!5, name path=line#1] (16*#1-0.5,0) -- (16*#1-0.5,0|-T);
}
\path[name path=line9] (\pgfkeysvalueof{/pgfplots/xmax},0) -- (\pgfkeysvalueof{/pgfplots/xmax}, 0|-T);
\pgfplotsinvokeforeach{0,2,4,6,8} {
\addplot [fill=black!5] fill between[of=line#1 and
line#1];
}
\addplot[
ybar interval,
x filter/.code=\pgfmathparse{#1-0.5},
fill = black!20] table {data.txt};
\end{axis}
\end{tikzpicture}
\caption{Plot.}
\end{figure}
\end{document}
答案1
您可以使用\the\numexpr#1+1。
\documentclass[11pt]{article}
\usepackage[top=2.54cm,bottom=2.54cm,left=2.75cm,right=2.75cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\pgfplotsset{compat=1.17}
\begin{filecontents}{data.txt}
0 10000
1 15000
2 10000
3 20000
4 5000
5 0
\end{filecontents}
\begin{document}
\begin{figure}
\centering
\begin{tikzpicture}
\begin{axis} [
height = \axisdefaultheight,
width = \textwidth,
xlabel = Channel,
ylabel = Counts,
ymin = 0,
xmin = -5,
xmax = 132,
xtick pos = left,
axis on top,
]
% Vertical division of each Board [0-7]
\path (current axis.above origin) coordinate (T);
\pgfplotsinvokeforeach{0,...,8}{
\draw[draw=black!5, name path=line#1] (16*#1-0.5,0) -- (16*#1-0.5,0|-T);
}
\path[name path=line9] (\pgfkeysvalueof{/pgfplots/xmax},0) -- (\pgfkeysvalueof{/pgfplots/xmax}, 0|-T);
\pgfplotsinvokeforeach{0,2,4,6} {
\addplot [fill=black!5] fill between[of=line#1 and
line\the\numexpr#1+1\relax];
}
\addplot[
ybar interval,
x filter/.code=\pgfmathparse{#1-0.5},
fill = black!20] table {data.txt};
\end{axis}
\end{tikzpicture}
\caption{Plot.}
\end{figure}
\end{document}
