       Re: Problems with recursive function

• To: mathgroup at smc.vnet.net
• Subject: [mg87400] Re: Problems with recursive function
• From: Frank Hechtner <frank.hechtner at rub.de>
• Date: Wed, 9 Apr 2008 05:58:02 -0400 (EDT)
• References: <ftfela\$bv1\$1@smc.vnet.net> <ftfk9j\$fav\$1@smc.vnet.net>

```hi daniel,

thanks four your help. that?s the missing information i was searching
for. You?re right, it would be better, to store each intermediate value.

Kind regards from germany

frank

> Hi Frank,
>
> if I understand correctly, you need to define a recursion with a stop
>
> criterion. You can do this by e.g.:
>
> test[0,_]:=5;
>
> test[n_,b_]:=test[n-1,b] b;
>
> test[10,5]
>
> 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=5 regardless to b.
>
>
>
>
>> Frank
>
>
>
>

```

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