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MathGroup Archive 1999

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Re: QUESTION ABOUT PLOT VECTOR FIELD

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18918] Re: QUESTION ABOUT PLOT VECTOR FIELD
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Tue, 27 Jul 1999 22:17:23 -0400
  • Organization: Universitaet Leipzig
  • References: <7ni60c$5nj@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

cut the singular value say

1/($MachineEpsilon+r)

instead of

1/r

This may prevent the overflow.

Hope that helps
  Jens

"Ing. Antonio F.R. CARABIO" wrote:
> 
> I am running Mathematica 2.1, and having trouble using Plot Vector Field
> when trying to plot electrostatic fields with singularities of type 1/r
> or 1/r^2 at the origin of coordinates. Often when the plot goes near the
> origin, the programme answers "Floating Point Error" and the PC goes out
> of service. Is there any way of getting a plot in this case?, or do I
> have to accept only graphics in regions far from the origin? Can you
> help me, please? Thanks in advance. Rubin Carabio. Buenos Aires.
> Argentina.
> 
> acarabio at arnet.com.ar


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