PsTricks, Brüche in den Achsenlabels

[jbecker]

Vielen Dank!

Für Interessierte, noch um die entsprechende Anpassung für die x-Achse ergänzt:

\documentclass{scrartcl}
\usepackage{pstricks}
\usepackage{pst-plot}
\newcounter{tmpX}
\newcounter{tmpY}
\makeatletter
\renewcommand*\setFractionvLabels{%
  \def\pst@@@vlabel##1{\psvlabel{##1}}
  \def\psvlabel##1{%
      \ifnum\psk@yfractionLabelBase<2 \def\de@nominator{\@ne}\else\def\de@nominator{\psk@yfractionLabelBase}\fi
      \def\pst@tempA{##1}% 
      \pst@abs{\pst@tempA}\pst@cntm 
      \setcounter{tmpX}{\numexpr-\pst@tempA\relax}% + 2016-08-29
      \pst@mod{\pst@cntm}{\de@nominator}\pst@cntp % cntb=##1 modulo trigLabelBase
      \ifnum\@ne>\pst@cntp                  % 1 > modulo -> then we have pi/x
        \pst@cnto=\pst@cntm \divide\pst@cnto by \de@nominator  
	\ifPst@ymathLabel$\psk@ylabelFontSize\ifnum\pst@tempA<0 -\fi\the\pst@cnto\psk@ylabelFactor$%
	\else             \psk@ylabelFontSize\ifnum\pst@tempA<0 -\fi\the\pst@cnto\psk@ylabelFactor
	\fi
      \else
	\ifPst@ymathLabel
          $\psk@ylabelFontSize
          \ifnum\pst@cntp=\@ne                % < 1?    $
            \if\pst@cntm=\@ne
              \frac{1}{\de@nominator}\psk@ylabelFactor%   % 1/x
            \else\ifnum\pst@tempA=-1 -\frac{1}{\de@nominator}\psk@ylabelFactor% mod 2016-08-29: \frac{-1} --> -\frac{1}
              \else \ifnum\pst@tempA=1 \frac{1}{\de@nominator}\psk@ylabelFactor%
                \else
                  \ifnum\pst@tempA<0    %+ 2016-08-29
                    -\frac{\the\value{tmpX}}{\de@nominator}\psk@ylabelFactor% + 2016-08-29
                  \else %+ 2016-08-29
                    \frac{\pst@tempA}{\de@nominator}\psk@ylabelFactor% x/y
                  \fi %+ 2016-08-29
            \fi\fi\fi
          \else
            \ifnum\pst@tempA=1 \frac{1}{\de@nominator}\psk@ylabelFactor%
            \else\ifnum\pst@tempA=\de@nominator 1\psk@xlabelFactor \else
              \ifnum\pst@tempA<0    %+ 2016-08-29
                -\frac{\the\value{tmpX}}{\de@nominator}\psk@ylabelFactor% + 2016-08-29
              \else %+ 2016-08-29
                \frac{\pst@tempA}{\de@nominator}\psk@ylabelFactor%
              \fi   %+ 2016-08-29
          \fi\fi\fi$
	\else
          \psk@ylabelFontSize
          \ifnum\pst@cntp=\@ne%                % < 1?
            \if\pst@cntm=\@ne
              $\frac{1}{\de@nominator}\psk@ylabelFactor$%   % 1/x
            \else\ifnum\pst@tempA=-1 $\frac{-1}{\de@nominator}\psk@ylabelFactor$%
              \else \ifnum\pst@tempA=1 $\frac{1}{\de@nominator}\psk@ylabelFactor$%
                \else$\frac{\pst@tempA}{\de@nominator}\psk@ylabelFactor$% x/y
            \fi\fi\fi%
          \else%
            \ifnum\pst@tempA=1 $\frac{1}{\de@nominator}\psk@ylabelFactor$%
            \else\ifnum\pst@tempA=\de@nominator 1\psk@ylabelFactor
              \else$\frac{\pst@tempA}{\de@nominator}\psk@ylabelFactor$%   %$
          \fi\fi\fi
	\fi
      \fi
    }%
}%$
\renewcommand*\setFractionhLabels{%
  \def\pst@@@hlabel##1{\pshlabel{##1}}
  \def\pshlabel##1{%
      \ifnum\psk@xfractionLabelBase<2 \def\de@nominator{\@ne}\else\def\de@nominator{\psk@xfractionLabelBase}\fi
      \def\pst@tempA{##1}% 
      \pst@abs{\pst@tempA}\pst@cntm 
      \setcounter{tmpY}{\numexpr-\pst@tempA\relax}% + 2016-08-29
      \pst@mod{\pst@cntm}{\de@nominator}\pst@cntp % cntb=##1 modulo trigLabelBase
      \ifnum\@ne>\pst@cntp                  % 1 > modulo -> then we have pi/x
        \pst@cnto=\pst@cntm \divide\pst@cnto by \de@nominator  
	\ifPst@ymathLabel$\psk@xlabelFontSize\ifnum\pst@tempA<0 -\fi\the\pst@cnto\psk@xlabelFactor$%
	\else             \psk@xlabelFontSize\ifnum\pst@tempA<0 -\fi\the\pst@cnto\psk@xlabelFactor
	\fi
      \else
	\ifPst@xmathLabel
          $\psk@xlabelFontSize
          \ifnum\pst@cntp=\@ne                % < 1?    $
            \if\pst@cntm=\@ne
              \frac{1}{\de@nominator}\psk@xlabelFactor%   % 1/x
            \else\ifnum\pst@tempA=-1 -\frac{1}{\de@nominator}\psk@xlabelFactor% mod 2016-08-29: \frac{-1} --> -\frac{1}
              \else \ifnum\pst@tempA=1 \frac{1}{\de@nominator}\psk@xlabelFactor%
                \else
                  \ifnum\pst@tempA<0    %+ 2016-08-29
                    -\frac{\the\value{tmpY}}{\de@nominator}\psk@xlabelFactor% + 2016-08-29
                  \else %+ 2016-08-29
                    \frac{\pst@tempA}{\de@nominator}\psk@xlabelFactor% x/y
                  \fi %+ 2016-08-29
            \fi\fi\fi
          \else
            \ifnum\pst@tempA=1 \frac{1}{\de@nominator}\psk@xlabelFactor%
            \else\ifnum\pst@tempA=\de@nominator 1\psk@ylabelFactor \else
              \ifnum\pst@tempA<0    %+ 2016-08-29
                -\frac{\the\value{tmpY}}{\de@nominator}\psk@xlabelFactor% + 2016-08-29
              \else %+ 2016-08-29
                \frac{\pst@tempA}{\de@nominator}\psk@xlabelFactor%
              \fi   %+ 2016-08-29
          \fi\fi\fi$
	\else
          \psk@xlabelFontSize
          \ifnum\pst@cntp=\@ne%                % < 1?
            \if\pst@cntm=\@ne
              $\frac{1}{\de@nominator}\psk@xlabelFactor$%   % 1/x
            \else\ifnum\pst@tempA=-1 $\frac{-1}{\de@nominator}\psk@xlabelFactor$%
              \else \ifnum\pst@tempA=1 $\frac{1}{\de@nominator}\psk@xlabelFactor$%
                \else$\frac{\pst@tempA}{\de@nominator}\psk@xlabelFactor$% x/y
            \fi\fi\fi%
          \else%
            \ifnum\pst@tempA=1 $\frac{1}{\de@nominator}\psk@xlabelFactor$%
            \else\ifnum\pst@tempA=\de@nominator 1\psk@xlabelFactor
              \else$\frac{\pst@tempA}{\de@nominator}\psk@xlabelFactor$%   %$
          \fi\fi\fi
	\fi
      \fi
    }%
}%$
\makeatother
\begin{document}
\begin{pspicture}(-4,-4)(4,4)
\psset{fractionLabels,fractionLabelBase=3,unit=1cm}
\psaxes{->}(0,0)(-4,-4)(4,4)
\end{pspicture}
\end{document}