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mandelbrot in version 7 & Ruskeepaa version 3

• To: mathgroup at smc.vnet.net
• Subject: [mg120423] mandelbrot in version 7 & Ruskeepaa version 3
• From: "DaleJenk" <dale.jenkins8 at deletegooglemail.com>
• Date: Thu, 21 Jul 2011 21:09:03 -0400 (EDT)

I bought Mathematica 7 Home Edition last year. I'm trying to plot the 
Mandelbrot Set following the instructions in Ruskeepaa's Mathematica 
Navigator version 3. I'm getting an error message.

Here's what I am introducing:

mandelbrot = Compile[{{c,_Complex}},
Module[{z=0+0I, n=0}, While[Abs[z]<2 && n<50, z=z^2+c; n++]; n]];

DensityPlot[mandelbrot[x+Iy], {x,-2,1},{y,-1.5,1.5}, PlotPoints->200, 
Mesh->False, FrameTicks->{{-2,-1,0,1},{-1,0,1}}]; //Timing

I get the message:

CompiledFunction::cfsa:
Argument -1.99998 + Iy at position 1 should be a machine-size complex 
number.

Where am I going wrong?

Thanks.
 

• Follow-Ups:
  • Re: mandelbrot in version 7 & Ruskeepaa version 3
    • From: Curtis Osterhoudt <cfo@lanl.gov>