`\includegraphics` side-by-side and filling text-width

Question

Instead of the figure environment I am trying to use the \includegraphics command to add pictures to an appendix.

\begin{center}
    \includegraphics[scale=\linewidth]{../pics/results_t/props_T_i_a}
\end{center}

Idea from here for adding a picture without the float feature.

Two questions:

1. How do I add two images side-by-side? This is something I would usually do with subfigure inside the figure environment.

2. Instead of setting the scaling to a set number, I would like to set the text line width as is the usual method for figures. the \linewidth and \textwidth commands as shown in the code give errors, so how can I use them properly?

Answer 1

An appendix often consists of many many figures, or only figures. Having them float around will do no good. Hence, put the graphics inside the text directly.

\documentclass{article}
\usepackage{mwe}
\usepackage{showframe}
\begin{document}
\begin{center}
    \includegraphics[width=.5\textwidth]{example-image-a}%
    \includegraphics[width=.5\textwidth]{example-image-b}%
\end{center}
\end{document}

You can also define a new environment, possibly together with package capt-of.

\documentclass{article}
\usepackage{mwe}
\usepackage{showframe}
\usepackage{capt-of}
\newenvironment{appendixfig}{\addvspace{5ex}\noindent\begin{minipage}{\linewidth}%
}{%
\end{minipage}\par\addvspace{4ex}%
}
\begin{document}
\begin{appendixfig}
    \includegraphics[width=.5\textwidth]{example-image-a}%
    \includegraphics[width=.5\textwidth]{example-image-b}%
\end{appendixfig}
\begin{appendixfig}
    \includegraphics[width=.5\textwidth]{example-image-a}%
    \includegraphics[width=.5\textwidth]{example-image-b}%
    \captionof{figure}{Two nice figures}
\end{appendixfig}
\end{document}