Re: ImplicitPlot problem
- To: mathgroup at smc.vnet.net
- Subject: [mg68171] Re: ImplicitPlot problem
- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
- Date: Thu, 27 Jul 2006 05:29:49 -0400 (EDT)
- Organization: Uni Leipzig
- References: <ea72a7$k44$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, the problem is, that Mathematica assume the function is continuous. Because x/y change it sign from y==0-eps to y==0+eps and it asssume that there must be a zero between the sign changes. But the Numerator will not contribute an zero and ImplicitPlot[Denominator[x/y] == 0, {x, -1, 1}, {y, -1, 1}] will do it. Regards Jens "Antonios Papazoglou" <antonios.papazoglou at epfl.ch> schrieb im Newsbeitrag news:ea72a7$k44$1 at smc.vnet.net... | | | Hello, | | I'm using ImplicitPlot to plot the line of zeros of a complicated function | f(x,y) on the (x,y) plane. However, not only the line of zeros is ploted, | but also the line where the function f diverges. | | Simple example: take f(x,y)=x/y | Then ImplicitPlot plots a cross, although the zeros are only the line x=0. | | This is probably due to a problem of the underlying ContourPlot function | that is used implicitly. | | Is there a way around this problem? | | Thanks, Antonios |