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Re: Problems with recursive function

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  • Subject: [mg87364] Re: Problems with recursive function
  • From: dh <dh at>
  • Date: Tue, 8 Apr 2008 07:17:11 -0400 (EDT)
  • References: <ftfela$bv1$>

Hi Frank,

if I understand correctly, you need to define a recursion with a stop 

criterion. You can do this by e.g.:


test[n_,b_]:=test[n-1,b] b;


if you have many calculations, it may be advantageously to store 

intermediate results:

test[n_,b_]:=test[n-1,b]=test[n-1,b] b;

hope this helps, Daniel

Frank Hechtner wrote:

> Dear Newsgroup,


> I'm in trouble with a recursive function. the functios looks similar to 

> test[a_, b_] := test[a - 1, b]*b. A is the index b should just be an 

> argument of test.

> for any calculation i need to tell mathematica the first value of the 

> function, e.g. test[0, 5]=5. The problem is the following: the first 

> object is independent of b. does anyone know a way to tell mathematica 

> the following thing:


>   test[0,b]=5 => test[0]=5 regardless to b.


> Thanks for your help.


> Frank


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