Path: csiph.com!fu-berlin.de!uni-berlin.de!news.dfncis.de!not-for-mail From: =?UTF-8?Q?Hans-Bernhard_Br=c3=b6ker?= Newsgroups: comp.graphics.apps.gnuplot Subject: Re: Substract value from contour line to surface Date: Mon, 17 Sep 2018 22:25:48 +0200 Lines: 13 Message-ID: References: <452156f4-823d-4c96-822e-0ef8d56b0d81@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.dfncis.de kgIexB+6jeVv/+2x8Lx6CQALF3iPiYnG90g8CL3x94j2+mJQUHRdo0vaAi Cancel-Lock: sha1:bbF2jPV2NWowuCT34J6wQJO9fRE= User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.0 In-Reply-To: <452156f4-823d-4c96-822e-0ef8d56b0d81@googlegroups.com> Content-Language: de-DE Xref: csiph.com comp.graphics.apps.gnuplot:4038 Am 17.09.2018 um 17:17 schrieb laterite@laposte.net: > Hi, > > I have an analytical 2D function G(x,y) and a .dat file giving me the x0,y0 points solution of the equation G(x0,y0)=0 in a .dat file. There is not really such a thing as "the" points that fulfill that criterion --- at least none where that whole set fits into a finite-size data file. So let's say you have some subset of that in a file. > Now, I would like to plot the surface of the function G(x,y0)-G(x0,y0). How isn't that the exact same surface as G(x,y) itself? You've just renamed the second independent variable and subtracted a constant zero!