siunitx
I'm writing a paper and my advisor is requiring that all large numbers have a comma as a thousands separator. I've read this question which asks about how to make siunitx not throw errors when there is a comma in the input, but how can I force a comma in the output when using \SI?
Ideally it would only do it for numbers with more than 4 digits — ie. \SI{9000} would not contain a space or comma but \SI{10000} would be 10,000. But if that's not possible, I'd settle for 9,000 also.
Don't worry, be happy. :)
\documentclass{article}
\usepackage{icomma}
\usepackage[output-decimal-marker={,}]{siunitx}
\begin{document}
$2,33=\num{2,33}$
\end{document}
siunitx-independent PGF solutionThe same behaviour of siunitx’ option group-four-digits set to false can be achieved in PGF with the /pgf/number format/min exponent for 1000 sep style.
From the PGF manual, section 66.1 “Changing display styles”, p. 547:
/pgf/number format/min exponent for 1000 sep={<number>}(no default, initially0)Defines the smallest exponent in scientic notation which is required to draw thousand separators. The exponent is the number of digits minus one, so
<number>= 4 will use thousand separators starting with 1e4 = 10000.A value of
0disables this feature (negative values are ignored).
\documentclass{article}
\usepackage{siunitx}
\usepackage{pgf}
\sisetup{
group-digits=true,
group-separator={\,},
}
\pgfkeys{
/pgf/number format/.cd,
set thousands separator={\,},
min exponent for 1000 sep=4,
}
\begin{document}
\begin{tabular}{rll}
siunitx: &\num{9000} &\num{19000} \\
pgf: &\pgfmathprintnumber{9000} &\pgfmathprintnumber{19000} \\
\end{tabular}
\end{document}
siunitx and PGFIf you want to use siunitx and PGF’s number printing system consistently together you should check out siunitx “little” \SendSettingsToPgf macro.
From the siunitx manual, section 7.9 “Transferring settings to PGF”, p. 63:
The numerical engine in the
pgfpackage has settings similar to those insiunitx. To enable working with both packages easily, the macro\SendSettingsToPgfis available. It will set some commonly-used numerical formatting options inpgfto the current values used bysiunitxto make using the two packages together more convenient for end users. This function can be used at any point after loading both thepgfandsiunitxpackages.
As group-four-digits is set to false per default there are no further adjustment needed in your example.
\documentclass{article}
\usepackage{siunitx}
\usepackage{pgf}
\sisetup{
group-digits=true,
group-separator={\,},
% group-four-digits=false,% default setting
}
\SendSettingsToPgf
\begin{document}
\begin{tabular}{rll}
siunitx: &\num{9000} &\num{19000} \\
pgf: &\pgfmathprintnumber{9000} &\pgfmathprintnumber{19000} \\
\end{tabular}
\end{document}
Best Answer
This is described in section 5.6 Printing numbers of the manual (for v. 2.5s, dated 2013/07/31). The
group-separatorkey defines the separator between groups of digits. By default grouping is not applied for numbers with four digits (e.g. 9000), so there's no need to do anything for that. (This can be changed withgroup-minimum-digits, which defines how many digits must be present for grouping to apply.)