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Re: Plotting piecewise in 2D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109751] Re: Plotting piecewise in 2D
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Fri, 14 May 2010 19:58:06 -0400 (EDT)

Because it is hard to see a point? 

However, the following shows an excessively large area:

DensityPlot[
 If[Abs[x] < 0.001 && Abs[y] < 0.001, 1000, 0],
 {x, -1, 1}, {y, -1, 1}]

"If" is a programming construct not a mathematical function. Piecewise works better.

DensityPlot[
 Piecewise[{{1000, Abs[x] < 0.001 && Abs[y] < 0.001}}],
 {x, -1, 1}, {y, -1, 1}]


Bob Hanlon

---- Jim Lambaugh <lambaugh at gmail.com> wrote: 

=============
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.




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