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Re: scattering data with MPFITFUN [message #84968 is a reply to message #84964]

Thu, 20 June 2013 01:23

Nafiseh Masoumzadeh is currently offline

Nafiseh Masoumzadeh
Messages: 10
Registered: June 2013

Junior Member

On Thursday, June 20, 2013 5:51:16 AM UTC+2, Craig Markwardt wrote:
> On Wednesday, June 19, 2013 6:49:43 PM UTC-4, Nafiseh Masoumzadeh wrote:
>
>> Hello,
>
>>
>
>> I have some data which I simply want to fit p[0]*x^P[1] on them, But
>
>> I don't know I am receiving very far results!
>
>> I am using mpfitfun like this:
>
>>
>
>> start=[0.001, 0.1]
>
>> results=MPFITFUN('MYFUNCTION', x, y, err, start)
>
>>
>
>> I applied this function and points in MATLAB (fitting toolbox) , and I had reasonable coefficients .
>
>
>
> MPFITFUN can solve problems like this.
>
>
>
> What happens when you say,
>
> YMODEL = MYFUNCTION(X, START)
>
> Do you get sensible values for YMODEL?
>
>
>
> You should also be checking the STATUS and ERRMSG keywords to see if there is a more informative error message.
>
>
>
> Craig Markwardt

yes, I got reasonable result from YMODEL. and for STATUS I got 6 and I don't have any ERRMSG. I checked in MPFIT script that 6 for STATUS means

FTOL is too small. no further reduction in
; the sum of squares is possible.

but I cannot figure out what is the problem?

I'd appreciate your help,

regards,
Nafis

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[Message index]

		scattering data with MPFITFUN By: Nafiseh Masoumzadeh on Wed, 19 June 2013 15:49
		Re: scattering data with MPFITFUN By: Craig Markwardt on Wed, 19 June 2013 20:51
		Re: scattering data with MPFITFUN By: Nafiseh Masoumzadeh on Thu, 20 June 2013 01:23
		Re: scattering data with MPFITFUN By: Craig Markwardt on Thu, 20 June 2013 12:00
		Re: scattering data with MPFITFUN By: Nafiseh Masoumzadeh on Sat, 22 June 2013 14:37
		Re: scattering data with MPFITFUN By: Craig Markwardt on Sun, 23 June 2013 18:59
		Re: scattering data with MPFITFUN By: David Fanning on Sun, 23 June 2013 19:29

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