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Re: Plot[x Sin[x],{-100,100}] Bad {-100,99} Good?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg38296] Re: Plot[x Sin[x],{-100,100}] Bad {-100,99} Good?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 12 Dec 2002 01:31:15 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <at4d54$etu$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

set the PlotPoints option to a value that resolve the oscillations
and 

Plot[x Sin[x], {x, -100, 100}, PlotPoints -> 66]

will work fine.

Regards
  Jens


"Steven T. Hatton" wrote:
> 
> 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."


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