\colorlet{saved}{.}里面caption会产生错误。我不明白为什么？我该如何解决这个问题？有没有更好的替代方案\colorlet{saved}{.}？
梅威瑟：
\documentclass{article}
\usepackage{amsmath,xcolor}
\usepackage{graphicx}
\begin{document}
\begin{figure}[h]
\caption{Example of a parametric plot ($\colorlet{saved}{.}\sin (x), \cos(x), x$)}
\centering
\includegraphics[width=0.5\textwidth]{example-image}
\end{figure}
\end{document}
现实例子：
\documentclass{article}
\usepackage{xifthen}
\usepackage{amsmath,xcolor}
\usepackage[colorlinks]{hyperref}
\usepackage{glossaries}
\usepackage{graphicx}
\colorlet{linkcolor}{red!70}
\hypersetup{linkcolor=linkcolor}
\makeglossaries
\newglossaryentry{X}
{
name={\ensuremath{X}},
description={Some quantity that changes over time can have index (corresponding to the time) and superscript}
}
\newcommand{\Xsubsuper}[2]{\colorlet{saved}{.}\ensuremath{\glslink{X}{X\ifthenelse{\isempty{#1}}{}{_{\mathcolor{saved}{#1}}}\ifthenelse{\isempty{#2}}{}{^{\mathcolor{saved}{#2}}}}}%
}
\newglossaryentry{t}
{
name={\ensuremath{t}},
description={time can have index and superscript}
}
\newcommand{\tsubsuper}[2]{\colorlet{saved}{.}\ensuremath{\glslink{t}{t\ifthenelse{\isempty{#1}}{}{_{\mathcolor{saved}{#1}}}\ifthenelse{\isempty{#2}{}}{}{^{\mathcolor{saved}{#2}}}}}%
}
\begin{document}
\begin{figure}[h]
\caption{\color{blue} Example of a parametric plot ($\sin (\Xsubsuper{3}{5}), \cos(x), x$)}
\centering
\includegraphics[width=0.5\textwidth]{example-image}
\end{figure}
\noindent$X_1^3$\\
$\Xsubsuper{}{}_1^3$ wrong spacing\\
$\Xsubsuper{1}{3}$ correct spacing\\
$\Xsubsuper{}{3}$\\
{\color{green}
$\tsubsuper{1}{3}$\\
$\tsubsuper{}{3}$\\
$\Xsubsuper{\tsubsuper{1}{3}}{3}$}
\printglossary[title=Notation,toctitle=Notation]
\end{document}
据我所知，它生成了正确的 pdf，但它给出了 2 条错误消息：
\Hy@tempa 的参数有一个额外的}。
<inserted text>
\par
l.33 ...t ($\sin (\Xsubsuper{3}{5}), \cos(x), x$)}
I've run across a `}' that doesn't seem to match anything.
For example, `\def\a#1{...}' and `\a}' would produce
this error. If you simply proceed now, the `\par' that
I've just inserted will cause me to report a runaway
argument that might be the root of the problem. But if
your `}' was spurious, just type `2' and it will go away.
和
失控的争论？
\@captype {\XC@colorlet }\def \reserved@b {\XC@colorlet [{}]}\futurelet \ETC.
! Paragraph ended before \Hy@tempa was complete.
<to be read again>
\par
l.33 ...t ($\sin (\Xsubsuper{3}{5}), \cos(x), x$)}
I suspect you've forgotten a `}', causing me to apply this
control sequence to too much text. How can we recover?
My plan is to forget the whole thing and hope for the best.
答案1
如果你真的需要这样的构造，你应该将它们隐藏在一个强大的命令中，例如定义\NewDocumentCommand
\documentclass{article}
\usepackage{xifthen}
\usepackage{amsmath,xcolor}
\usepackage[colorlinks]{hyperref}
\usepackage{glossaries}
\usepackage{graphicx}
\colorlet{linkcolor}{red!70}
\hypersetup{linkcolor=linkcolor}
\makeglossaries
\newglossaryentry{X}
{
name={\ensuremath{X}},
description={Some quantity that changes over time can have index (corresponding to the time) and superscript}
}
\NewDocumentCommand\Xsubsuper{mm}{\colorlet{saved}{.}\ensuremath{\glslink{X}{X\ifthenelse{\isempty{#1}}{}{_{\mathcolor{saved}{#1}}}\ifthenelse{\isempty{#2}}{}{^{\mathcolor{saved}{#2}}}}}%
}
\newglossaryentry{t}
{
name={\ensuremath{t}},
description={time can have index and superscript}
}
\newcommand{\tsubsuper}[2]{\colorlet{saved}{.}\ensuremath{\glslink{t}{t\ifthenelse{\isempty{#1}}{}{_{\mathcolor{saved}{#1}}}\ifthenelse{\isempty{#2}{}}{}{^{\mathcolor{saved}{#2}}}}}%
}
\begin{document}
\begin{figure}[h]
\caption{\color{blue} Example of a parametric plot ($\sin (\Xsubsuper{3}{5}), \cos(x), x$)}
\centering
\includegraphics[width=0.5\textwidth]{example-image}
\end{figure}
\noindent$X_1^3$\\
$\Xsubsuper{}{}_1^3$ wrong spacing\\
$\Xsubsuper{1}{3}$ correct spacing\\
$\Xsubsuper{}{3}$\\
{\color{green}
$\tsubsuper{1}{3}$\\
$\tsubsuper{}{3}$\\
$\Xsubsuper{\tsubsuper{1}{3}}{3}$}
\printglossary[title=Notation,toctitle=Notation]
\end{document}