begin{figure}
 psset{unit=0.7, linewidth=0.7pslinewidth, mathLabel=false}
 begin{pspicture}[showgrid=false](-3, -4) (3, 4)
 psgrid[griddots=5, subgriddiv=0, gridlabels=0pt](-3, -4)(3, 4)
 psplot[algebraic, plotstyle=line, plotpoints=500, linecolor=red}, ]{-3}{3}{x^3)
 end{pspicture}
 end{figure}