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<p class="MsoNormal"><span style="color:#1F497D">Minimal example for x^\frac{1}{3} curve:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> \begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> \psplot[linewidth=1.15pt,arrows=<->]{-2}{2}{x 1 3 div exp}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> \end{psgraph}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Minimal example for parameterised curve:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">\def\FuncA{t 1 3 div exp 1 t sub 1 3 div exp}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> \begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> \parametricplot[linewidth=1.15pt,arrows=<->]{-8}{-0.1}{\FuncA}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> \end{psgraph}<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">(by the way, it’s GhostScript that reports the error!)<o:p></o:p></span></p>
<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> Hubert Lam
<br>
<b>Sent:</b> Saturday, May 3, 2014 10:33 PM<br>
<b>To:</b> pstricks@tug.org<br>
<b>Subject:</b> Dumb question -- asked before?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi all<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m sure I’ve asked this before but I can’t seem to find it again in the archives.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I remember some years ago I asked about \psplot doing some cube root function, and it would fail at $x = 0$.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What was the workaround for this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Reason: I’m trying to sketch $x^3 + y^3 = 1$ but without \psplotimp which gives of course, a much poorer image than if I were to parameterise it to<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">$x = t^{\frac{1}{3}}$ and $y = (1- t)^{\frac{1}{3}}$.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hubert<o:p></o:p></p>
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