I am writing a paper in LaTeX. I will need both the one-column and two-column versions of the paper. For this, the figure sizes/configurations need to be different in the two documents. I am looking for a command like \iftwocolumn! Do you know if it exists and if not how can I define and use it?
I would need something like:
\begin{figure}[tb]
\iftwocolumn\includegraphics[width=0.7\linewidth]{FiguresDouble/figure.eps}
\else\includegraphics[width=0.5\linewidth]{FiguresSingle/figure.eps}
\fi
\linewidth or \columnwidth should work, since a non-twocolumn document technically consists of a single column (of width \columnwidth).
However, if you're using the traditional twocolumn mode of (say) article, the condition \if@twocolumn is available for testing/branching.
Here's a short example showing the difference:
\documentclass{article}
\usepackage{graphicx,showframe}% http://ctan.org/pkg/{graphicx,showframe}
\begin{document}
\noindent
\makeatletter%
\if@twocolumn%
\includegraphics[width=\columnwidth]{example-image-a}%
\else% \@twocolumnfalse
\includegraphics[width=\columnwidth]{example-image-b}%
\fi
\makeatother
\end{document}
Note that you require the use of a \makeatletter...\makeatother pair, since the command definition of the conditional contains @. See What do \makeatletter and \makeatother do?
Here is how I made a conditional to do different things with one or two columns:
\documentclass[onecolumn]{article}
\begin{document}
\makeatletter
\if@twocolumn
\newcommand{\whencolumns}[2]{
#2
}
\else
\newcommand{\whencolumns}[2]{
#1
}
\fi
\makeatother
\whencolumns{One Column}{Two Columns}
\end{document}
When this is defined, you can do the original question like:
\whencolumns{
\includegraphics[width=0.5\linewidth]{FiguresSingle/figure.eps}
}{
\includegraphics[width=0.7\linewidth]{FiguresDouble/figure.eps}
}
This method does assume that the entire document is one or two columns and isn't switching.
