[pstricks] Dumb question -- asked before?
Thomas Söll
Thomas.Soell at onlinehome.de
Sat May 3 18:38:34 CEST 2014
Hallo Hubert,
do you mean this? then you have to look for the negative roots.
\begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}
\parametricplot[linewidth=1.15pt,arrows=<-,plotpoints=200]{-8}{0}{t neg 1 3 div exp neg 1 t sub 1 3 div exp}
\parametricplot[linewidth=1.15pt,plotpoints=200]{0}{1}{t 1 3 div exp 1 t sub 1 3 div exp}
\parametricplot[linewidth=1.15pt,arrows=->,plotpoints=200]{1}{8}{t 1 3 div exp 1 t sub neg 1 3 div exp neg}
\end{psgraph}
\begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}
\psplot[linewidth=1.15pt,arrows=<-,plotpoints=200]{-2}{0}{x neg 1 3 div exp neg}
\psplot[linewidth=1.15pt,arrows=->,plotpoints=200]{0}{2}{x 1 3 div exp}
\end{psgraph}
Thomas
From: Hubert Lam
Sent: Saturday, May 3, 2014 2:34 PM
To: pstricks at tug.org
Subject: Re: [pstricks] Dumb question -- asked before?
Minimal example for x^\frac{1}{3} curve:
\begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}
\psplot[linewidth=1.15pt,arrows=<->]{-2}{2}{x 1 3 div exp}
\end{psgraph}
Minimal example for parameterised curve:
\def\FuncA{t 1 3 div exp 1 t sub 1 3 div exp}
\begin{psgraph}{->}(0,0)(-2,-2)(2,2){0.8\linewidth}{0.8\linewidth}
\parametricplot[linewidth=1.15pt,arrows=<->]{-8}{-0.1}{\FuncA}
\end{psgraph}
(by the way, it’s GhostScript that reports the error!)
From: Hubert Lam
Sent: Saturday, May 3, 2014 10:33 PM
To: pstricks at tug.org
Subject: Dumb question -- asked before?
Hi all
I’m sure I’ve asked this before but I can’t seem to find it again in the archives.
I remember some years ago I asked about \psplot doing some cube root function, and it would fail at $x = 0$.
What was the workaround for this?
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
$x = t^{\frac{1}{3}}$ and $y = (1- t)^{\frac{1}{3}}$.
Many thanks
Hubert
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