Re: Re: Re: Extracting contour values from

*To*: mathgroup at smc.vnet.net*Subject*: [mg100838] Re: [mg100834] Re: [mg100808] Re: Extracting contour values from*From*: Syd Geraghty <sydgeraghty at me.com>*Date*: Tue, 16 Jun 2009 21:48:58 -0400 (EDT)*References*: <h12gg4$ect$1@smc.vnet.net> <200906150119.VAA11428@smc.vnet.net>

Hi Curtis, The solution provided by Yan Zhuang was embarrassingly easy to implement, use MaxRecursion:- ContourPlot[Cos[x*y], {x, -Pi, Pi}, {y, -Pi, Pi}, MaxRecursion -> 6] >>You could try to use MaxRecursion option for ContourPlot. I have attached >>a notebook to show the result. >>Sincerely, >>Ms. Yan Zhuang, Ph.D. >>Technical Support >>Wolfram Research, Inc. It is intriguing to note that you really do need the value of MaxRecursion >5 to erase this ContourPlot "artifact"! Also with MaxRecursion -> {0,1} the plot is different than without the option! Try:- Table[ContourPlot[Cos[x*y], {x, -Pi, Pi}, {y, -Pi, Pi}, MaxRecursion - > i], {i, 0,6,1}] Also: WorkingPrecision-> n (where n<1000) does not affect the result. Neither does PerformanceGoal -> "Quality". My thanks to Yan for a prompt and precise solution. I suggest however that in the interests of continuous improvement of the Mathematica I love that whatever is causing this behaviour is fixed in a future release. Cheers ... Syd Syd Geraghty B.Sc, M.Sc. sydgeraghty at mac.com Mathematica 7.0.1 for Mac OS X x86 (64 - bit) (18th February 2009) MacOS X V 10.5.6 MacBook Pro 2.33 GHz Intel Core 2 Duo 2GB RAM On Jun 15, 2009, at 12:21 PM, Curtis Osterhoudt wrote: > Yup. Shows up here, too (7.0.0 on a linux system). It can be > somewhat remediated by explicitly giving a relatively large (and > odd) number of PlotPoints, like PlotPoints->99. The hole in the > middle will be filled in--mostly. >

**References**:**Re: Extracting contour values from ContourPlot***From:*Jens-Peer Kuska <kuska@informatik.uni-leipzig.de>