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> >