Math & Science ⇒ Alignment glitch with siunitx numbers

[Cham]

In the following MWE example, I would like to align all the numbers with their \pm symbol :

Code: Select all

\documentclass[10pt,letterpaper]{book}
\usepackage{lmodern}
\usepackage{amsmath}
\usepackage[separate-uncertainty=true]{siunitx}
\sisetup{output-decimal-marker = {,}}
\usepackage{icomma}
\usepackage{tensor}

\begin{document}

	\begin{alignat*}{2}
		\tensor{\mathcal{N}}{_1} &= \SI{0,03+-0,04}{\mA}, \\
		\tensor{\mathcal{N}}{_2} &= \SI{-0,02+-0,05}{\mA}, \\
		\tensor{\mathcal{N}}{_3} &= \SI{0,01+-0,02}{\mA}, \\
		\tensor{\mathcal{N}}{_4} &= \SI{-0,04+-0,03}{\mA}, \\
		\tensor{\mathcal{M}}{_1} &= \SI{0,003+-0,004}{\V}, \\
		\tensor{\mathcal{M}}{_2} &= \SI{0,06+-0,09}{\V}, \\
		\tensor{\mathcal{M}}{_3} &= \SI{-0,08+-0,05}{\V}.
	\end{alignat*}

\end{document}

Preview of what this code is doing :

numbers.jpg (22.66 KiB) Viewed 4789 times

How can I align the numbers on their +- sign (red line) ? I tried adding commands like [cmd]\phantom{-}[/cmd], but it doesn't work well.

[mas]

Are you articular about using {alignat}? I feel {tabular} with siunitx would better serve you.

Using {alignat}, I split the quantities into more columns which gives what you want.

Code: Select all

\documentclass[10pt,letterpaper]{book}
\usepackage{lmodern}
\usepackage{amsmath}
\usepackage[separate-uncertainty=true]{siunitx}
\sisetup{output-decimal-marker = {,}}
\usepackage{icomma}
\usepackage{tensor}
 
\begin{document}
 
\begin{alignat*}{4}
  \tensor{\mathcal{N}}{_1} &= &\num{ 0,03} &\,\pm\,& &\SI{0,04}{\mA}, \\
  \tensor{\mathcal{N}}{_2} &= &\num{-0,02} &\,\pm\,& &\SI{0,05}{\mA}, \\
  \tensor{\mathcal{N}}{_3} &= &\num{ 0,01} &\,\pm\,& &\SI{0,02}{\mA}, \\
  \tensor{\mathcal{N}}{_4} &= &\num{-0,04} &\,\pm\,& &\SI{0,03}{\mA}, \\
  \tensor{\mathcal{M}}{_1} &= &\num{0,003} &\,\pm\,& &\SI{0,004}{\V}, \\
  \tensor{\mathcal{M}}{_2} &= &\num{ 0,06} &\,\pm\,& &\SI{0,09}{\V}, \\
  \tensor{\mathcal{M}}{_3} &= &\num{-0,08} &\,\pm\,& &\SI{0,05}{\V}.
\end{alignat*}
 
\end{document}

The output

x.png (6.93 KiB) Viewed 4778 times

[Cham]

Hmm, the spacings are looking a bit weird. Maybe I should align the units instead of the +- ? Or the commas of the first values (not their uncertainty)?? How should I do this ?

[Stefan Kottwitz]

I would align at relations, operators, and the decimal point (or fill up with zeroes at the right and align the numbers at the right then).

Stefan

[Cham]

Stefan, can you be more specific ? Your code version, please ?