Re: Re: question about nest

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg1973] Re: [mg1961] Re: question about nest*From*: Lou Talman <me at talmanl.mscd.edu>*Date*: Wed, 30 Aug 1995 01:51:02 -0400

In article <DDsGrD.Gy6 at wri.com>, ORLANDO LUIS GOULART PERES <orlando at axp.ift.unesp.br> wrote: >Dear Wizards > >I have a function with two variables >f[x_,a_]:=a*x*(1-x) >And I need the n-compose function >Nest[f,x,n] >But Mathematica look for a function f[x] and not f[x,a] >Is this possible to use Nest with this two variable function? >For example, I need >f[x,a], f[f[x,a],a], f[f[f[x,a],a],a] . >Later I will put many values for "a" . >Regards >Orlando Peres Seems to me the easiest thing to do is: Clear[f, a, x] f[x_] := a x (1 - x) The use of SetDelayed in the definition of the function 'f' assures that the current value of 'a' will always be used when 'f[x]' is evaluated. Now assign the desired value to the variable 'a' and apply Nest or NestList: NestList[f, x, n] --Lou Talman