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Re: How to plot divergence of gradient as contour plot

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124031] Re: How to plot divergence of gradient as contour plot
  • From: Peter Breitfeld <phbrf at t-online.de>
  • Date: Fri, 6 Jan 2012 04:17:44 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <je402c$efu$1@smc.vnet.net>

Szymon Roziewski wrote:

> Hello there,
>
> I am concerning to plot something like that.
>
> ContourPlot[Divergence[Gradient[Sin[x + y]]], {x, -5, 5}, {y, -5, 5}]
>
> Plotting divergence of gradient scalar field.
> How can I manage to do that?
>
> Best regards,
> Szymon Roziewski

Try this:

Needs["VectorAnalysis`"]
SetCoordinates[Cartesian[x,y,z]]   (*usual cartesian coordinates *)

ContourPlot[Evaluate@Div@Grad[Sin[x+y]],{x,-5,5},{y,-5,5}]

You need to include Evaluate, dew to the way Plot works.

-- 
_________________________________________________________________
Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de



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