How to get fractional labels with psaxes?

The objective is to get fractional labels (not in decimal) for both vertical and horizontal axes.

In my experience, non-trigonometric labels are written in decimals and trigonometric labels can be written in fractional via trigLabels and trigLabelBase. I attempted to abuse these keys to get fractional non-trigonometric by using \let\pi=\relax, but it causes a problem where

• \pi/n becomes /n (that should be 1/n),

• -\pi/n becomes -/n (that should be -1/n),

• -\pi becomes - (that should be -1),

• \pi becomes <empty> (that should be 1) where <empty> stands for empty .

My question, what is the best trick to convert every \pi to relax but prevent the problems from happening?

\documentclass[pstricks,border=12pt,12pt]{standalone}
\usepackage{pst-plot}
\usepackage[nomessages]{fp}

\FPeval\XMin{0-2}
\FPeval\XMax{2}
\FPeval\YMin{0-1}
\FPeval\YMax{1}
\FPeval\temp{1/3}

\psset
{
ytrigLabels=true,
xtrigLabels=true,
trigLabelBase=3,
unit=3cm,
}

\let\pi=\relax

\begin{document}
\begin{pspicture}(\XMin,\YMin)(\XMax,\YMax)
\psaxes[dx=\temp,dy=\temp](0,0)(\XMin,\YMin)(\XMax,\YMax)
\psplot[algebraic,plotpoints=100]{\XMin}{\XMax}{x-2/3}
\end{pspicture}
\end{document}


More general case

Sometimes I need to change \pi to \sqrt{2}, for example. I tried with

\let\pi={\sqrt{2}}


but it does not compile.

-

The version 1.71 from http://texnik.dante.de/tex/generic/pst-plot/ knows fractionLabel:

\errorcontextlines=100
\documentclass[pstricks,border=12pt,12pt]{standalone}
\usepackage{pst-plot}
\psset{fractionLabels,fractionLabelBase=3,unit=3cm}

\begin{document}
\begin{pspicture}(-2,-1)(2,1)
\psaxes[dx=0.333,dy=0.333](0,0)(-2,-1)(2,1)
\psplot[algebraic,plotpoints=100]{-2}{2}{x-2/3}
\end{pspicture}
\end{document}


However, there is a spurious space which needs some more investigation.

-
Sorry, is it possible to change \pi with e, \sqrt{m}, etc such that we can have \frac{e}{n}, \frac{\sqrt{m}}{n}, etc where n is the fractionLabelBase? –  stalking is prohibited Aug 24 at 9:33
for example: xlabelFactor=\sqrt{2} or \def\pi{e} –  Herbert Aug 24 at 9:38
Sorry. Using xlabelFactor makes the factor appear on the right of the fractional labels rather than in the numerator of the fractional labels. As a result, there are some "oddities" such as -1\sqrt{2} and 1\sqrt{2}. It will be better if we can change \pi in the numerator with \sqrt{2}, for example. –  stalking is prohibited Aug 24 at 9:49
\def\pi{\sqrt{2}} for example –  Herbert Aug 24 at 9:57
The update of pst-plot was done on August 24 but up to now it has not been propagated to TeXLive mirrors. A weird thing happened: pst-poly updated on August 28 has been propagated to TeXLive mirrors. –  stalking is prohibited Sep 1 at 19:47