\documentclass[a4paper]{book}
\usepackage{filecontents}
\usepackage{subcaption}
\usepackage{graphicx}
\begin{filecontents*}{happyRel.csv}
happy,sampleA,sampleB
1,36,18
2,24,43
3,26,20
4,2,9
5,0,10
6,13,0
7,2,2
\end{filecontents*}
\begin{filecontents*}{sadRel.csv}
sad,sampleA,sampleB
< 15,3,7
16 - 50,15,16
51 - 100,8,50
101 - 500,12,24
> 500,11,3
∅,50,0
\end{filecontents*}
\begin{filecontents*}{happines.tex}
\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usepackage{pgfplotstable}
\begin{document}
\pgfplotstableread[col sep=comma]{happyRel.csv}\datatable
\begin{tikzpicture}
\begin{axis}[
title=Happiness,
ybar,
ymin=0,
ymax=55,
xticklabels={ji, 1, 2, 3, 4, 5, 6, 7},
xticklabel style={anchor=center, anchor=north},
yticklabels = {ji, \(0\%\), \(10\%\), \(20\%\), \(30\%\), \(40\%\), \(50\%\)},
point meta=explicit symbolic,
%xtick pos=left, % align x-axis ticks to left side
legend style={at={(1,0.95)},
anchor=north,
legend columns=1,
fill=white,
/tikz/every odd column/.append style={column sep=0.5cm},
/tikz/every even column/.append style={column sep=0.1cm},
nodes={anchor=west}, % align text to the left
},
]
\addplot table[x expr=\coordindex, y=sampleA, meta=sampleA]{\datatable};
\addplot table[x expr=\coordindex, y=sampleB, meta=sampleB]{\datatable};
\legend{Sample A (\(N=26\)), Sample B (\(N=23\))}
\end{axis}
\end{tikzpicture}
\end{document}
\end{filecontents*}
\begin{filecontents*}{sadness.tex}
\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usepackage{pgfplotstable}
\begin{document}
\pgfplotstableread[col sep=comma]{sadRel.csv}\datatable
\begin{tikzpicture}
\begin{axis}[
title=Sadness (people),
ybar,
ymin=0,
ymax=55,
xticklabels={ji, <15, 16-50, 51-100, 101-500, >500, \(-\)},
xticklabel style={rotate=45,anchor=center,anchor=north east},
yticklabels = {ji, \(0\%\), \(10\%\), \(20\%\), \(30\%\), \(40\%\), \(50\%\)},
ytick distance=10, % set distance between x-axis ticks to 1
point meta=explicit symbolic,
xtick pos=left, % align x-axis ticks to left side
]
\addplot table[x expr=\coordindex, y=sampleA, meta=sampleA]{\datatable};
\addplot table[x expr=\coordindex, y=sampleB, meta=sampleB]{\datatable};
\end{axis}
\end{tikzpicture}
\end{document}
\end{filecontents*}
\begin{document}
\chapter{First chapter}
\chapter{Second chapter}
\begin{figure}
\centering
\begin{subfigure}[t]{0.49\linewidth}
\centering
\includegraphics[width=1.2\linewidth]{happines.pdf}
\caption{Likert scale responses of people's happiness}
\label{fig:happy}
\end{subfigure}
\begin{subfigure}[t]{0.49\linewidth}
\centering
\includegraphics[width=\linewidth]{sadness.pdf}
\caption{Demographic responses of people's sadness}
\label{fig:sad}
\end{subfigure}
\caption{A general caption to explain the common things of the graph}
\label{fig:happysad}
\end{figure}
I think if I make the picture in its own \texttt{happysad.tex} file, I won't be able to get the most accurate referencing system (e.\@~g.\@ figure \ref{fig:happy}).
\end{document}
对于所有这些糟糕的操作filecontents，我深表歉意，这只是为了近似我的工作结构（当没有被MWE设计时）。
我该如何让图例不透明呢b？
