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Re: Re: FindFit & NIntegrate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96183] Re: [mg96162] Re: FindFit & NIntegrate
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Mon, 9 Feb 2009 05:31:03 -0500 (EST)
  • References: <gmecbc$acc$1@smc.vnet.net> <gmguqa$2u0$1@smc.vnet.net>
  • Reply-to: drmajorbob at longhorns.com

Amen.

WRI knows that a thousand users a day stumble over this, and they've had  
ample time to prevent it somehow.

Bobby

On Sat, 07 Feb 2009 02:38:53 -0600, ADL <alberto.dilullo at tiscali.it> wrote:

> Dear Jens-Peer,
> if a questions appears over and over ("10^6 times before") it should
> mean something to thinking people!
>
> Latins used to say, "Errare humanum est, perseverare diabolicum". Does
> this mean anything to Mathematica developers? Do you mean that it is
> impossible to find a sensible way to do something that 10^6 people
> would do differently?
>
> ADL
>
>
> On 6 Feb, 10:10, Jens-Peer Kuska <ku... at informatik.uni-leipzig.de>
> wrote:
>> Hi,
>>
>> and
>>
>> model[x_?NumericQ,a_?NumericQ,b_?NumericQ,c_?NumericQ]:=
>>    NIntegrate[function[x_,t_,a_,b_,c_],{t,0,inf}];
>>
>> will work. We had this 10^6 times before.
>>
>> Regards
>>    Jens
>>
>>
>>
>> hmalissa wrote:
>> > I want to use the FindFit function (or similar) to fit some
>> > experimental data:
>>
>> > fit=FindFit[data,expr,pars,vars]
>>
>> > Usually this works very well, but in this particular case the model
>> > expr consists of a NIntegrate over another function, like:
>>
>> > model[x_,a_,b_,c_]:=NIntegrate[function[x_,t_,a_,b_,c_],{t,0,inf}];
>> > fit=FindFit[data,model[x,a,b,c],{a,b,c},x]
>>
>> > FindFit now complains about non-numerical values; of course that makes
>> > sense.
>> > How can I force FindFit to do the fitting anyway?
>
>



-- 
DrMajorBob at longhorns.com


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