Re: Problems with recursive function
- To: mathgroup at smc.vnet.net
- Subject: [mg87364] Re: Problems with recursive function
- From: dh <dh at metrohm.ch>
- Date: Tue, 8 Apr 2008 07:17:11 -0400 (EDT)
- References: <ftfela$bv1$1@smc.vnet.net>
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[0]=5 regardless to b. > > Thanks for your help. > > Frank >