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MathGroup Archive 2006

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Re: calculate Recurrence Equations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68762] Re: calculate Recurrence Equations
  • From: "Dana" <ddelouis at bellsouth.net>
  • Date: Fri, 18 Aug 2006 03:12:07 -0400 (EDT)
  • References: <ec1a1u$omo$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi.  I believe the syntax of your equations are a little off.  This worked 
for me...

In[1]:=
equ = {
 v[0] == 1,
 v[n] == v[n - 1] + (v[n - 1]*5 - 1)/100
} ;


In[2]:=
RSolve[equ, v[n], n]

Out[2]=
{{v[n] -> (1/5)*(1 + 4^(1 - n)*(21/5)^n)}}

-- 
HTH.  :>)

Dana DeLouis
Mathematica 5.2



"Frank Hechtner" <frank.hechtner at rub.de> wrote in message 
news:ec1a1u$omo$1 at smc.vnet.net...
> hi,
>
> i?m in trouble with my Recurrence Equations:
>
> i?ve defined the following function
>
> anteil[0] = 1
> anteil[n_] := anteil[n - 1] + (anteil[n - 1]*5 - 1)/100
>
> i want mathematica to calculate the values for anteil[30] and so on.
>
> Unfortunately mathematica needs for this calculation over 2 hours (and
> is still running, athlon x2 4600, 2 gb ram).
>
> I don?t see where are the difficulties for mathematica...
>
> Thanx for your help
>
> frank
> 


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