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

FPevalXMin{0-2}
FPevalXMax{2}
FPevalYMin{0-1}
FPevalYMax{1}
FPevaltemp{1/3}

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

letpi=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}