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Re: Error detected while calling MPFIT_FDJAC2 [message #71489 is a reply to message #71488]

Tue, 22 June 2010 21:47

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

On Jun 22, 5:40 am, Fermiona Fermiona <fermion...@gmail.com> wrote:
> Hello Dr. Craige,
>
> I didn't compute the derivatives. The user function returnes the
> residual:
>
> FUNCTION LinearFit, p, X=x, Y=y, ERR=err, $
> perror=perror, bestnorm=bestnorm, dof=dof
>
> model = p[0]+p[1]*x
> resid = (y-model)/err
>
> return, resid
> END
>
> and inside the procedure, I had:
>
> p0 = [51.0,-0.5]
> args = {X:x_n, Y:y_n, ERR:yerr}
> fit_res = mpfit('LinearFit', p0, functargs=args,perror=perror,
> bestnorm=bestnorm, dof=dof)
>
> The first time I called mpfit outside of the loop, there was no
> error.
> When mpfit was called again, from inside the loop this time, I got the
> error I mentioned.
>

I'm guessing what "inside" and "outside" of a loop might mean.

Forgetting a loop, does your experience mean that you can call MPFIT
with some arguments a first time, and it works; and then you do it
again with *exactly* the same arguments and it fails? That would be
odd.

Or, do you mean you are calling MPFIT recursively?

Craig

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[Message index]

		Re: Error detected while calling MPFIT_FDJAC2 By: Craig Markwardt on Wed, 23 June 2010 17:16
		Re: Error detected while calling MPFIT_FDJAC2 By: Fermiona Fermiona on Wed, 23 June 2010 01:39
		Re: Error detected while calling MPFIT_FDJAC2 By: Fermiona Fermiona on Tue, 22 June 2010 23:35
		Re: Error detected while calling MPFIT_FDJAC2 By: Craig Markwardt on Tue, 22 June 2010 21:47
		Re: Error detected while calling MPFIT_FDJAC2 By: Fermiona Fermiona on Tue, 22 June 2010 02:40
		Re: Error detected while calling MPFIT_FDJAC2 By: Craig Markwardt on Tue, 22 June 2010 00:48
		Re: Error detected while calling MPFIT_FDJAC2 By: pete.petrus on Thu, 01 May 2014 07:28
		Re: Error detected while calling MPFIT_FDJAC2 By: Craig Markwardt on Thu, 01 May 2014 10:34

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