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MathGroup Archive 1995

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Re: question about nest

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1952] Re: question about nest
  • From: jfs at he3.neep.wisc.edu (John F. Santarius)
  • Date: Sat, 26 Aug 1995 00:09:57 -0400
  • Organization: University of Wisconsin

In article <DDsGrD.Gy6 at wri.com> ORLANDO LUIS GOULART PERES <orlando at axp.ift.unesp.br> writes:

   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" .


Try Nest[ f[#,a]&, x, n ].  For example,

In[1]:= f[x_,a_] := a x (1-x)

In[2]:= Nest[ f[#,a]&, x, 2 ]

         2
Out[2]= a  (1 - x) x (1 - a (1 - x) x)


==============================================================================
John F. Santarius, Fusion Technology Institute, University of Wisconsin,
  1500 Engineering Dr., Madison, WI 53706, USA
E-mail: santarius at engr.wisc.edu       Ph: 608/263-1694       Fax: 608/263-4499
==============================================================================
--
==============================================================================
John F. Santarius, Fusion Technology Institute, University of Wisconsin,
  1500 Engineering Dr., Madison, WI 53706, USA
E-mail: santarius at engr.wisc.edu       Ph: 608/263-1694       Fax: 608/263-4499
==============================================================================


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