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I want to be able to add the source information below figures and tables ( longtables included). I have used the idea provided in this post, but it gives the following error for longtables:

! Misplaced \noalign.
\caption ->\noalign

Is it possible to fix and have a single command that would for those enviroments?

Here is a minimal code to reproduce it.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{longtable,booktabs}
\usepackage{blindtext}

\newcommand{\source}[1]{
 \vspace{1ex}\caption*{\textbf{Source:} {#1}}
}


\begin{document}


\begin{table}[h]
\caption{Test - Table}\label{t:test}
\begin{tabular}{p{0.5\textwidth} p{0.5\textwidth}}
\toprule
\blindtext & \blindtext \
\bottomrule
\end{tabular}
\source{Test Test}
\end{table}


\newpage


\begin{longtable}{p{0.5\textwidth} p{0.5\textwidth}}
\caption{Test - Longtable} \label{lt:test} \
\toprule
\blindtext & \blindtext \
\midrule
\blindtext & \blindtext \
\midrule
\blindtext & \blindtext \
\bottomrule
\source{Test longtable 123}
\end{longtable}


\newpage


\begin{figure}[h]
 \centering
 \includegraphics[width=0.5\textwidth]{example-image-a}
 \caption{Test123.}\label{fig-img-a}
 \source{Test image.}
\end{figure}


\end{document}
LEo
  • 772
  • 1
    Why not simply use \multicolumn{2}{@{}l}Source …} as the last row of the table? – Bernard Nov 18 '20 at 14:35
  • It compiles fine without the \vspace{1ex} and with \\ after \source{Test longtable 123}. –  Nov 18 '20 at 14:53

1 Answers1

2

The longtable environment does not like the combination of \vspave plus \caption, at least not without an extra \\ between them.

Solution: Do not use \vspave but let \caption do the skip, for example:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{longtable,booktabs}
\usepackage{blindtext}

\newcommand{\source}[1]{
 \captionsetup{skip=1ex,position=b}%
 \caption*{\textbf{Source:} {#1}}
}


\begin{document}


\begin{table}[h]
\caption{Test - Table}\label{t:test}
\begin{tabular}{p{0.5\textwidth} p{0.5\textwidth}}
\toprule
\blindtext & \blindtext \
\bottomrule
\end{tabular}
\source{Test Test}
\end{table}


\newpage


\begin{longtable}{p{0.5\textwidth} p{0.5\textwidth}}
\caption{Test - Longtable} \label{lt:test} \
\toprule
\blindtext & \blindtext \
\midrule
\blindtext & \blindtext \
\midrule
\blindtext & \blindtext \
\bottomrule
\source{Test longtable 123} \
\end{longtable}


\newpage


\begin{figure}[h]
 \centering
 \includegraphics[width=0.5\textwidth]{example-image-a}
 \caption{Test123.}\label{fig-img-a}
 \source{Test image.}
\end{figure}


\end{document}