Using scrartcl as my document class, tables are set in a slightly larger font size than my normal text (12pt vs. 11pt I suppose). How can I change the font size for tables document wide? At the moment I just add a \small to all my tables.
[Tex/LaTex] Change font size in tables document-wide
fontsizetables
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Not really an answer to your question. But there are special classes for presentations (which is what you want to do) that change fonts etc.
The most famous is probably beamer but there are also some specifically for transparencies if you want that. Have a look at the catalogue.
Which one is standard?
The migration to a newer document class should be considered the "current" standard (since 17 December 2009). So, using elsarticle should be what you go with if you're producing a publication for Elsevier.
How can I change them all like a set?
You should modify this at the document-level, rather than on an individual basis. The reason for this is that the other font sizes of document elements are relative to the base, most likely set using font switches like \small, \large, etc. Using
\documentclass{elsarticle}
creates a 10pt default text font size (since it's based on the classic article document class). You can also try class options 11pt or 12pt, which is supported by default.
Here are some more details regarding elsarticle:
The title (or \maketitle under the final or default option) is set using \MaketitleBox:
\long\def\MaketitleBox{%
\resetTitleCounters
\def\baselinestretch{1}%
\begin{center}%
\def\baselinestretch{1}%
\Large\@title\par\vskip18pt
\normalsize\elsauthors\par\vskip10pt
\footnotesize\itshape\elsaddress\par\vskip36pt
\hrule\vskip12pt
\ifvoid\absbox\else\unvbox\absbox\par\vskip10pt\fi
\ifvoid\keybox\else\unvbox\keybox\par\vskip10pt\fi
\hrule\vskip12pt
\end{center}%
}
setting the title in \Large (not bold), the author in \normalsize and the address in \footnotesize. If you want a bold title (\bfseries), 14.5pt authors (\large or 14.4pt under 12pt) and 11pt address (\small or 10.95pt under 12pt), you need to use
\documentclass[12pt]{elsarticle}% `\normalsize is 12pt
\title{{\bfseries My title}}% Bold title, 17.28pt
\author{\large An Author}% \large or 14.4pt author
\address{\small Random City}% \small or 10.95pt address
\begin{document}
\maketitle
%...
\end{document}
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