siunitx
Is it possible to display a per-mode=fraction unit as a small fraction (\tfrac) in displaystyle math mode? In the following MWE, the first output is what I want in the displaystyle math mode.
\documentclass{minimal}
\usepackage{siunitx}
\sisetup{per-mode=fraction}
\begin{document}
$\SI{1}{\metre\per\second}$
$\displaystyle \SI{1}{\metre\per\second}$
\end{document}
One possibility to keep being flexible would be to redefine \ang with an xparse argument signature like the following {omo} to add the optional unit in the third argument. This macro then could easily be redefined.
Unfortunately this would either include a call to \SI and thus loosing the possibilities of anglular minutes and angular seconds of the original \ang macro or include a call to the old \ang macro. The latter is to my knowledge not possible without code duplication, as neither the \let nor the \LetLtxMacro commands can cope with macros defined by xparse (which is the case for \ang defined in siunitx).
As a workaround it is possible to use the following definition until there is a better solution:
\NewDocumentCommand{\angsi}{omom}{%
\ang[#1]{#2}\si[#3]{#4}%
}
Then it is possible to write
\angsi{42}{\per\second}
or
\angsi{1;2;3}{\per\second}
and add spacing as \, to the macro definition later, if that should be needed.
Update:
I contacted Joseph Wright (siunitx package author) and he proposes
<num>°\,s^{-1}
according to the NIST standard:
There is a space between the numerical value and unit symbol, even
when the value is used in an adjectival sense, except in the case
of superscript units for plane angle.
So that's the way to go, which can be achieved by
\NewDocumentCommand{\angsi}{omom}{%
\ang[#1]{#2}\,\si[#3]{#4}%
}
I guess this feature requires the usage of defined units instead of just text input. Compare the following two expressions:
\documentclass[11pt,
paper=a4,
footinclude,
oneside
]{scrbook}
\usepackage{mathtools}
\usepackage[ngerman]{babel}
\usepackage{graphicx}
\usepackage{caption}
\usepackage[european]{circuitikz}
\usepackage{float}
\usepackage{pgfplots}
\usepackage{amssymb}
\usepackage{siunitx}
\sisetup{exponent-product = \cdot, output-decimal-marker = {,}, per-mode = fraction}
\begin{document}
$\SI{1}{\per cm^3}$
$\SI{1}{\per\centi\meter\cubed}$
\end{document}
EDIT:
As Steven B. Segletes mentioned in his comment it might be a good idea to combine this with the option fraction-function=\dfrac in order to make those display style.
Best Answer
You can use the
fraction-functionkey ofsiunitx.\tfracis provided byamsmath.