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019-fig-caption.tex
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\documentclass{article}\usepackage[]{graphicx}\usepackage[]{color}
%% maxwidth is the original width if it is less than linewidth
%% otherwise use linewidth (to make sure the graphics do not exceed the margin)
\makeatletter
\def\maxwidth{ %
\ifdim\Gin@nat@width>\linewidth
\linewidth
\else
\Gin@nat@width
\fi
}
\makeatother
\definecolor{fgcolor}{rgb}{0.345, 0.345, 0.345}
\newcommand{\hlnum}[1]{\textcolor[rgb]{0.686,0.059,0.569}{#1}}%
\newcommand{\hlstr}[1]{\textcolor[rgb]{0.192,0.494,0.8}{#1}}%
\newcommand{\hlcom}[1]{\textcolor[rgb]{0.678,0.584,0.686}{\textit{#1}}}%
\newcommand{\hlopt}[1]{\textcolor[rgb]{0,0,0}{#1}}%
\newcommand{\hlstd}[1]{\textcolor[rgb]{0.345,0.345,0.345}{#1}}%
\newcommand{\hlkwa}[1]{\textcolor[rgb]{0.161,0.373,0.58}{\textbf{#1}}}%
\newcommand{\hlkwb}[1]{\textcolor[rgb]{0.69,0.353,0.396}{#1}}%
\newcommand{\hlkwc}[1]{\textcolor[rgb]{0.333,0.667,0.333}{#1}}%
\newcommand{\hlkwd}[1]{\textcolor[rgb]{0.737,0.353,0.396}{\textbf{#1}}}%
\usepackage{framed}
\makeatletter
\newenvironment{kframe}{%
\def\at@end@of@kframe{}%
\ifinner\ifhmode%
\def\at@end@of@kframe{\end{minipage}}%
\begin{minipage}{\columnwidth}%
\fi\fi%
\def\FrameCommand##1{\hskip\@totalleftmargin \hskip-\fboxsep
\colorbox{shadecolor}{##1}\hskip-\fboxsep
% There is no \\@totalrightmargin, so:
\hskip-\linewidth \hskip-\@totalleftmargin \hskip\columnwidth}%
\MakeFramed {\advance\hsize-\width
\@totalleftmargin\z@ \linewidth\hsize
\@setminipage}}%
{\par\unskip\endMakeFramed%
\at@end@of@kframe}
\makeatother
\definecolor{shadecolor}{rgb}{.97, .97, .97}
\definecolor{messagecolor}{rgb}{0, 0, 0}
\definecolor{warningcolor}{rgb}{1, 0, 1}
\definecolor{errorcolor}{rgb}{1, 0, 0}
\newenvironment{knitrout}{}{} % an empty environment to be redefined in TeX
\usepackage{alltt}
\IfFileExists{upquote.sty}{\usepackage{upquote}}{}
\begin{document}
Knitr can automatically generate a figure environment if fig.cap is specified.
\begin{knitrout}
\definecolor{shadecolor}{rgb}{0.969, 0.969, 0.969}\color{fgcolor}\begin{kframe}
\begin{alltt}
\hlkwd{par}\hlstd{(}\hlkwc{mar} \hlstd{=} \hlkwd{c}\hlstd{(}\hlnum{4}\hlstd{,} \hlnum{4}\hlstd{,} \hlnum{0.1}\hlstd{,} \hlnum{0.1}\hlstd{))}
\hlkwd{plot}\hlstd{(}\hlkwd{runif}\hlstd{(}\hlnum{4}\hlstd{))}
\end{alltt}
\end{kframe}\begin{figure}[]
\includegraphics[width=\maxwidth]{figure/019-fig-caption-test} \caption[$2 \times 2$ is 4]{$2 \times 2$ is 4\label{fig:test}}
\end{figure}
\end{knitrout}
When fig.cap needs to use objects in the current chunk, we need to set the eval.after options so the objects are available when fig.cap is used.
\begin{knitrout}
\definecolor{shadecolor}{rgb}{0.969, 0.969, 0.969}\color{fgcolor}\begin{kframe}
\begin{alltt}
\hlcom{# evaluate fig.cap after a chunk is evaluated}
\hlstd{opts_knit}\hlopt{$}\hlkwd{set}\hlstd{(}\hlkwc{eval.after} \hlstd{=} \hlstr{"fig.cap"}\hlstd{)}
\end{alltt}
\end{kframe}
\end{knitrout}
Dynamically generate a figure caption:
\begin{knitrout}
\definecolor{shadecolor}{rgb}{0.969, 0.969, 0.969}\color{fgcolor}\begin{kframe}
\begin{alltt}
\hlstd{x} \hlkwb{=} \hlkwd{rnorm}\hlstd{(}\hlnum{30}\hlstd{)}
\hlkwd{par}\hlstd{(}\hlkwc{mar} \hlstd{=} \hlkwd{c}\hlstd{(}\hlnum{4}\hlstd{,} \hlnum{4}\hlstd{,} \hlnum{0.1}\hlstd{,} \hlnum{0.1}\hlstd{))}
\hlkwd{hist}\hlstd{(x,} \hlkwc{main} \hlstd{=} \hlstr{""}\hlstd{)}
\end{alltt}
\end{kframe}\begin{figure}[]
\includegraphics[width=\maxwidth]{figure/019-fig-caption-t-test} \caption[The P-value is 0]{The P-value is 0.93\label{fig:t-test}}
\end{figure}
\end{knitrout}
Change the figure environment:
\begin{knitrout}
\definecolor{shadecolor}{rgb}{0.969, 0.969, 0.969}\color{fgcolor}\begin{kframe}
\begin{alltt}
\hlkwd{par}\hlstd{(}\hlkwc{mar} \hlstd{=} \hlkwd{c}\hlstd{(}\hlnum{4}\hlstd{,} \hlnum{4}\hlstd{,} \hlnum{0.1}\hlstd{,} \hlnum{0.1}\hlstd{))}
\hlkwd{boxplot}\hlstd{(x)}
\end{alltt}
\end{kframe}\begin{figure*}[]
\includegraphics[width=\maxwidth]{figure/019-fig-caption-figure-asterisk} \caption[Figure * environment]{Figure * environment.\label{fig:figure-asterisk}}
\end{figure*}
\end{knitrout}
If you have two figures, you can assign two captions to fig.cap:
\begin{knitrout}
\definecolor{shadecolor}{rgb}{0.969, 0.969, 0.969}\color{fgcolor}\begin{kframe}
\begin{alltt}
\hlkwd{par}\hlstd{(}\hlkwc{mar} \hlstd{=} \hlkwd{rep}\hlstd{(}\hlnum{0}\hlstd{,} \hlnum{4}\hlstd{),} \hlkwc{ann} \hlstd{=} \hlnum{FALSE}\hlstd{)}
\hlkwd{plot}\hlstd{(}\hlnum{1}\hlopt{:}\hlnum{10}\hlstd{)}
\end{alltt}
\end{kframe}\begin{figure}[]
{\centering \includegraphics[width=\maxwidth]{figure/019-fig-caption-two-caps1}
}
\caption[Hi figure one]{Hi figure one\label{fig:two-caps1}}
\end{figure}
\begin{kframe}\begin{alltt}
\hlkwd{plot}\hlstd{(}\hlkwd{runif}\hlstd{(}\hlnum{10}\hlstd{))}
\end{alltt}
\end{kframe}\begin{figure}[]
{\centering \includegraphics[width=\maxwidth]{figure/019-fig-caption-two-caps2}
}
\caption[Hi figure two]{Hi figure two\label{fig:two-caps2}}
\end{figure}
\end{knitrout}
You can use figure references too. For example, Figure \ref{fig:t-test} is a histogram, and Figure \ref{fig:figure-asterisk} is a boxplot. The reference key is ``fig: + the chunk label'' by default.
\end{document}