Re: newbie: can't Manipulate ListPlot of recurrence
- To: mathgroup at smc.vnet.net
- Subject: [mg96779] Re: newbie: can't Manipulate ListPlot of recurrence
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Wed, 25 Feb 2009 04:00:06 -0500 (EST)
- Organization: Uni Leipzig
- References: <go0j40$n0f$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
Hi,
you doing almost everything wrong. You mean
Manipulate[
ListPlot[ NestList[a # (1 - #) &, y, 50]], {{a, 3.5},
0, 4}, {{y, 0.4}, 0, 1}]
Atleast the assigment y=a y (1-y) in the ListPlot[] command
will change you y value on and on and so it is no wonder
that the slider is unmovable and moves unexpected.
Regards
Jens
Tom Roche wrote:
> summary: I'm trying to Manipulate the logistic map. I can ListPlot it,
> but when I try to Manipulate, the UI behaves weirdly.
>
> details:
>
> As advertised by the Subject:, I'm new to Mathematica (specifically
> 7.0.0 for Students for 32-bit Windows on XP Pro) so please excuse any
> lapses in terminology. I'd also appreciate pointers to specific docs
> rather than just an RTFM.
>
> I'm trying to model the logistic map y=a y (1-y):
>
> http://en.wikipedia.org/wiki/Logistic_map
> http://mathworld.wolfram.com/LogisticMap.html
> http://www.phy.duke.edu/~palmer/notebooks/LogisticMap.nb
>
> To start with I just tried to plot it, which works:
>
> Clear[a, y];
> a=3.5;
> y=0.4;
> ListPlot[Table[y=a y (1-y),{50}],Joined->True]
>
> I'd like to Manipulate a and y, but when I try to
>
> Clear[a, y];
> Manipulate[
> ListPlot[Table[y=a y (1-y),{50}],Joined->True], {{a, 3.5}, 0, 4},
> {{y, 0.4}, 0, 1}]
>
> I get weird behavior:
>
> 1 initially the y slider oscillates
>
> 2 initially the plot displays but flashes (apparently between two
> phases) until I click one of the sliders
>
> 3 the y slider will not move
>
> 4 the a slider can be dragged, but to no effect (i.e. the plot does
> not change)
>
> 5 there are no error messages
>
> What am I doing wrong? and how can I Manipulate this map?
>
> TIA, Tom Roche <Tom_Roche at pobox.com>
>