Re: [dk-tug] Angivelse af intervaller

Her er en fuldt konfigurerbar version, tænkte at det kunne være passende at smide på CTAN som en pakke, kan lige når det i tide til TL13.

Nogen forslag til pakke navn? Bare 'interval'?

Jeg har udvidet den således at der kan angives separate symboler for åben/lukket i begge sider, samt for separatortegnet i selve interfallet.

Vil have skrive forfatteren som 'The Danish TeX Collective', med mig selv som kontaktperson og dokumentør.

Jeg undrer mig lidt over at når jeg bruge nøgle/.link=anden nøgle, så skal 'anden nøgle' angives med fuld sti? Nogen der ved hvorfor?



\documentclass[12pt]{article}
\usepackage{pgfkeys}

\usepackage{amsmath}

\makeatletter

\newcommand\workhorse[1]{
  \def\hest{auto}
  \def\pony{#1}
  \ifx\hest\pony
    \def\openfence{\mathopen{}\mathclose\bgroup\left\leftfence}
    \def\closefence{\aftergroup\egroup\right\rightfence}
  \else
    \def\openfence{\mathopen{#1\leftfence}}
    \def\closefence{\mathclose{#1\rightfence}}
  \fi
}

% setup
\pgfkeys{/interval/.is family,/interval,
  open left fence/.initial={]},
  closed left fence/.initial={[},
  open right fence/.initial={[},
  closed right fence/.initial={]},
  left fence/.link=/interval/closed left fence,
  right fence/.link=/interval/closed right fence,
  separator symbol/.initial={,},
  open left/.style={ left fence/.link=/interval/open left fence },
  open right/.style={ right fence/.link=/interval/open right fence },
  open/.style={open left,open right},
  scaled/.code={\workhorse{#1}},
  scaled/.default=auto
}

% bruger konfiguration
\pgfkeys{
  interval,
  separator symbol=;,
  open left fence={(},
  open right fence={)},
}

\makeatother

\newcommand\interval[3][]{%
  \begingroup%
  \def\openfence{\mathopen{\leftfence}}%
  \def\closefence{\mathclose{\rightfence}}%
  \pgfkeys{interval,#1}%
  \pgfkeysgetvalue{/interval/left fence}{\leftfence}%
  \pgfkeysgetvalue{/interval/right fence}{\rightfence}%
  \openfence%
  #2%
  %,%
  \pgfkeysvalueof{/interval/separator symbol}
  #3%
  \closefence%
  \endgroup%
}

\begin{document}


\begin{align}
&A\in\interval{a}{b}\\
&A\in\interval[open]{a}{b}\\
&A\in\interval[open left]{a}{b}\\
&A\in\interval[open right,scaled]{a}{\frac12b}=B\\
&A\in\interval[scaled=\Big]{a}{b}\\
\end{align}


\end{document}



/Lars Madsen
Institut for Matematik / Department of Mathematics
Aarhus Universitet / Aarhus University
Mere info: http://au.dk/daleif@imf / More information: http://au.dk/en/daleif@imf