RE: Plot[x Sin[x],{-100,100}] Bad {-100,99} Good?
- To: mathgroup at smc.vnet.net
- Subject: [mg38308] RE: [mg38268] Plot[x Sin[x],{-100,100}] Bad {-100,99} Good?
- From: "David Park" <djmp at earthlink.net>
- Date: Thu, 12 Dec 2002 01:31:55 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Steven, With a highly oscillatory function like that you need to increase the number of PlotPoints. Otherwise Mathematica begins to miss some of the features of the curve. David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: Steven T. Hatton [mailto:hattons at globalsymmetry.com] To: mathgroup at smc.vnet.net This is Mathematica 4.2 on Linux. I evaluated Plot[x Sin[x], {-100,100}] and disvovered that the portion of the plot between,9.5Pi and 11Pi is displayed as a line segment joining the points {9.5 , 9.5 Sin[9.5]} and {11 , 11 Sin[11]}. I've also found that the plot from x=-100 to x=99.99 is incorrect. The plot over the range [-100,99] is correct. What is happening here? Does this happen on other systems? -- STH Hatton's Law: "There is only One inviolable Law."