From: <HIDDEN>
Newsgroups: comp.soft-sys.matlab
Subject: Re: out of memory error
Date: Fri, 27 Apr 2012 21:19:07 +0000 (UTC)
Organization: The MathWorks, Inc.
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References: <jna18u$6al$> <jnbjle$khr$> <jnesiu$81o$>
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"Sanaa" wrote in message <jnesiu$81o$>...
> Thanks a lot for your respond. I tried the command you wrote and I also tried to fix my code. First I got the error: Warning: axis limits too large
> I fixed the error but I don't get a 3-d picture! I only get dots...
> clear
> itermax=300;
> finalits=30;finits=itermax-(finalits-1);
> for ru=1:0.05:3;
> for a=0.01:0.05:1;
>     x=zeros(1,itermax);
>     x0=0.2;x1= 0.4;
>     x(1)=x0;x(2)=x1;
>     for i=2:itermax
>         x(i+1)= -a*x(i)+ ru*x(i-1)*(1-x(i-1));
>     end
>     plot3(a*ones(finalits),ru*ones(finalits),x(finits:itermax),'.','MarkerSize',1)
>     hold on
> end
> end
> fsize=15;
> set(gca,'XTick',1:0.5:2,'FontSize',fsize)
> set(gca,'YTick',0:0.2:1)
> set(gca,'ZTick',0:0.2:1)
> xlabel('ru','FontSize',fsize)
> ylabel('a','FontSize',fsize)
> zlabel('x','FontSize',fsize)
> hold off
> Any idea please?
> Thanks a lot and sorry for bothering you.
- - - - - - - - - - -
  Based on your previous threads, Sanaa, you are apparently trying to get bifurcation diagrams for another mapping, this one with two parameters, a and ru.  You are trying to illustrate this using 'plot3' to create a three dimensional picture of this bifurcation in which both a and ru are varied, but in my opinion this is a mistake.  Even if you had no troubles with memory, all you would see is a bewildering mass of points which would be extremely difficult to interpret.

  My suggestion is to set one of the parameters, perhaps a, to a constant and make a 2D diagram as ru varies.  Also be sure to use dots for your plot points, not lines.  Then repeat this for a series of diagrams as you vary a through some range of values.  This is the only way you are ever going to produce plot images that are capable of being interpreted properly.

Roger Stafford