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Re: mandelbrot in version 7 & Ruskeepaa version 3

  • To: mathgroup at smc.vnet.net
  • Subject: [mg120446] Re: mandelbrot in version 7 & Ruskeepaa version 3
  • From: "DaleJenk" <dale.jenkins8 at deletegooglemail.com>
  • Date: Fri, 22 Jul 2011 19:47:45 -0400 (EDT)
  • References: <j0aivf$ghq$1@smc.vnet.net> <j0b9l4$jjj$1@smc.vnet.net>

Many thanks - to you, and to the people who replied to me privately.

"Oleksandr Rasputinov" <oleksandr_rasputinov at hmamail.com> wrote in message 
news:j0b9l4$jjj$1 at smc.vnet.net...
> There is a space missing between I and y in the expression mandelbrot[x +
> Iy] (should be mandelbrot[x + I y]). Also, you should omit the semicolon
> after DensityPlot, otherwise the plot will not be shown.
>
> Incidentally, tabulating the values and then plotting them with ArrayPlot
> is faster for this example than using DensityPlot. That is,
>
> ArrayPlot@Table[
>   mandelbrot[x + I y],
>   {y, -1.5, 1.5, 0.005}, {x, -2.0, 1.0, 0.005}
>  ]
>
> On Fri, 22 Jul 2011 02:15:27 +0100, DaleJenk
> <dale.jenkins8 at deletegooglemail.com> wrote:
>
>> 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.
>>
> 


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