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Re: Mathematica 6.0 Desperation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg83686] Re: Mathematica 6.0 Desperation
  • From: congruentialuminaire at yahoo.com
  • Date: Wed, 28 Nov 2007 05:35:24 -0500 (EST)
  • References: <figtq9$fa7$1@smc.vnet.net>

Hello Jesus:

I have seen myriad examples "hang" V6. Some I have debugged, many
others have not had my attention yet.

I changed the code above to this:

Clear[JuliaTest];
JuliaTest[x_, y_, n_, c_] := Module[{z, num = 0},
  z = x + y I;
  While[Abs[z] < 2.0 && num < n, z = z^2 + c; num++];
  num
  ]

Then this:

DensityPlot[
 JuliaTest[x, y, 50, -0.75 + 0.5 I], {x, 1.24,   1.27}, {y, -0.13,
-0.1}, PlotPoints -> 50, Mesh -> False,  ColorFunction -> Hue]

Then the "Julia Set" is shown.

I did not check much to see why the old code does not work.  Note that
I removed Complile[].

HTH

Regards..Roger W.

On Nov 27, 3:07 am, "Jesus M. Goiri" <jesgoir... at mac.com> wrote:
>  Dear Sirs
>
>  I have tried some items that seem to hang Mathematica 6.0. However  
>  they work perfectly fine in the 5.2 version. I have tried to  
>  discover the flaw and I have not been able to do so. The problem  
>  pertains at some code I extracted from a book about Mathematica  
>  applications by Boccara, particularly the examples that relate to  
>  fractals, Julia and Mandelbrot Sets.
>
>  I have below the lines of code. I you try them, I'd wish to see if  
>  you are able to make them work.
>
>  Yours sincerely,
>
>  Jesus M, Goiri
>
>  Clear[JuliaTest]
>  JuliaTest = Compile[{x, y, {n, _Integer}, {c, _Complex}},
>    Module[{z, num = 0}, z = x + y I;
>      While[Abs[z] < 2.0 && num < n, z = z^2 + c; num++]; num]]
>  DensityPlot[JuliaTest[x, y, 50, -0.75 + 0.5 I],
>  {x, 1.24, 1.27}, {y, -0.13, -0.1}, PlotPoints -> 500,
>  Mesh -> False, ColorFunction -> Hue]



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