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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Calibri'; COLOR: #000000">
<DIV>Hallo Hubert,</DIV>
<DIV> </DIV>
<DIV>do you mean this? then you have to look for the negative roots.</DIV>
<DIV> </DIV>
<DIV>\begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}</DIV>
<DIV>\parametricplot[linewidth=1.15pt,arrows=<-,plotpoints=200]{-8}{0}{t neg
1 3 div exp neg 1 t sub 1 3 div exp}</DIV>
<DIV>\parametricplot[linewidth=1.15pt,plotpoints=200]{0}{1}{t 1 3 div exp 1 t
sub 1 3 div exp}</DIV>
<DIV>\parametricplot[linewidth=1.15pt,arrows=->,plotpoints=200]{1}{8}{t 1 3
div exp 1 t sub neg 1 3 div exp neg}</DIV>
<DIV>\end{psgraph}</DIV>
<DIV> </DIV>
<DIV>\begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}</DIV>
<DIV>\psplot[linewidth=1.15pt,arrows=<-,plotpoints=200]{-2}{0}{x neg 1 3 div
exp neg}</DIV>
<DIV>\psplot[linewidth=1.15pt,arrows=->,plotpoints=200]{0}{2}{x 1 3 div
exp}</DIV>
<DIV>\end{psgraph}</DIV>
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<DIV><FONT size=3 face=Calibri></FONT> </DIV>
<DIV><FONT size=3 face=Calibri></FONT> </DIV>
<DIV><FONT size=3 face=Calibri>Thomas</FONT></DIV>
<DIV><FONT size=3 face=Calibri></FONT> </DIV>
<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=hubert@lamfamily.info
href="mailto:hubert@lamfamily.info">Hubert Lam</A> </DIV>
<DIV><B>Sent:</B> Saturday, May 3, 2014 2:34 PM</DIV>
<DIV><B>To:</B> <A title=pstricks@tug.org
href="mailto:pstricks@tug.org">pstricks@tug.org</A> </DIV>
<DIV><B>Subject:</B> Re: [pstricks] Dumb question -- asked
before?</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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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></DIV></DIV>
<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></DIV>
<P>
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