Re: treatment on C[i]
- To: mathgroup at smc.vnet.net
- Subject: [mg100322] Re: treatment on C[i]
- From: Szabolcs <szhorvat at gmail.com>
- Date: Mon, 1 Jun 2009 07:06:32 -0400 (EDT)
- References: <gvtmfq$get$1@smc.vnet.net>
On May 31, 1:34 pm, olfa <olfa.mra... at yahoo.fr> wrote:
> Hi mathematica community,
> C[i] is the default form for the i th parameter or constant generated
> by mathematica in representing the results of various symbolic
> computations in such functions as DSolve, RSolve and Reduce.
> My question is: is it possible to know in advance how many C[i] will
> be generated?
> If not how to represent the generic form of them: For example I have
> an input with reduce and mathematica generates in the output C[1],C
> [2],C[3] and C[4] so four C[i] in the solutions but before that when I
> wrote the input I did not know that it will generate four C[i] and I
> need to use something in the input that represent C[i] in general
> without knowing how many of them will be generated? I have tried to
> use the pattern object _ like that C[ _ ] but it does not work.
>
You can always count them
Count[C[1] + C[2]/x, C[_], {0, \[Infinity]}]
or retrieve them
Cases[C[1] + C[2]/x, C[_], {0, \[Infinity]}]