On Tue, Oct 13, 2009 at 7:44 PM, Jason Grout <jason-s...@creativetrax.com> wrote: > > kcrisman wrote: >> >> >> On Oct 13, 6:05 pm, "ma...@mendelu.cz" <ma...@mendelu.cz> wrote: >>> Hello all, is there any other possibility how to plot implicit >>> function than implicitplot? >>> >>> I do not like implicitplot too much, since it is in fact countourplot >>> and it is not easy to set the color (for example). >> >> There is not currently any other way to do this, I think. A colleague >> of mine has some experimental code to implicit plot the "right" way >> (by following derivatives around and spot-checking nearby to not miss >> components, I guess), but doesn't consider it ready for prime time >> yet. > > > How do you do an implicit plot "right"? Scipy has tools for numerical > integration (you mention following derivatives), if that helps.
I think what the user wants is to be able to *work with* contour plots in the same way one can work with normal plots. E.g., set the color. Right now they are always black, right? Etc. > > A quick google search turns up several references to software: > http://geomblog.blogspot.com/2008/01/plotting-implicit-functions-bleg.html > > The maple help page may help: > http://www.maplesoft.com/support/help/Maple/view.aspx?path=plots/implicitplot > > This issue has come up before on the list (and Josh Kantor gave an > algorithm and a reference): > https://groups.google.com/group/sage-devel/browse_thread/thread/6b1d3d0f06db9c6a > > More references and algorithms: > http://www.tangentspace.net/cz/archives/2007/08/implicit-plotting-code-for-mathematica/ > > Mma also says: ContourPlot initially evaluates f at a grid of equally > spaced sample points specified by PlotPoints. Then it uses an adaptive > algorithm to subdivide at most MaxRecursion times to generate smooth > contours. http://reference.wolfram.com/mathematica/ref/ContourPlot.html > > Jason > > > -- > Jason Grout > > > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
