Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!news2.arglkargh.de!news.karotte.org!fu-berlin.de!uni-berlin.de!news.dfncis.de!not-for-mail From: =?ISO-8859-1?Q?Hans-Bernhard_Br=F6ker?= Newsgroups: comp.graphics.apps.gnuplot Subject: Re: How to plot (x^2+y^2-1)^3 - x^2*y^3 =0 in gunplot? Date: Sun, 28 Oct 2012 11:46:31 +0100 Lines: 14 Message-ID: References: <3df1436e-8d8f-4bc0-a6b7-ec678649e11b@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.dfncis.de jEaZN+T+EdXCZv7D5WJYkwZsdFOqMaA+EP5Jt2H3k6x5nAIL4PfpINc/imyv5mr2fYP1uAyQn5 Cancel-Lock: sha1:9IYmZ2BHJ9J8aB5xHc2OSRDhJOw= User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:15.0) Gecko/20120907 Thunderbird/15.0.1 In-Reply-To: <3df1436e-8d8f-4bc0-a6b7-ec678649e11b@googlegroups.com> Xref: csiph.com comp.graphics.apps.gnuplot:1441 On 27.10.2012 18:51, Shin wrote: > Does anybody knows how to plot (x^2+y^2-1)^3 - x^2*y^3 =0 in gunplot? gnuplot generally only does explicit or parametric curves, not implicit ones like the above. But you can fake it to some extent by asking for z=0 contour of the surface z = f(x,y)=(x^2+y^2-1)^3 - x^2*y^3: gnuplot> f(x,y) = (x**2+y**2-1)**3 - x**2*y**3 gnuplot> set contour base gnuplot> set cntrparam lev discrete 0 gnuplot> set isosamp 50 gnuplot> set view map; unset surf gnuplot> sp [-1.5:1.5][-1.5:1.5] f(x,y) w l