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Re: Plotting piecewise in 2D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109754] Re: Plotting piecewise in 2D
  • From: Peter Pein <petsie at dordos.net>
  • Date: Fri, 14 May 2010 19:58:39 -0400 (EDT)
  • References: <hsj5c1$j42$1@smc.vnet.net>

Am Fri, 14 May 2010 09:32:49 +0000 (UTC)
schrieb Jim Lambaugh <lambaugh at gmail.com>:

> Hi
> 
> Please take a look at
> 
> DensityPlot[If[x == 0 && y == 0, 1000, 0], {x, -1, 1}, {y, -1, 1}]
> 
> This just gives me a uniform plot. Why does the peak at (0,0) not show
> up?
> 
> Best,
> Jimmy.
> 

Because a point is too small for the real world ;-)

Try:
DensityPlot[If[Norm[{x, y}] <= 1*^-9, 1000, 0], {x, -1, 1}, {y, -1, 1}]

hth,
Peter



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