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Re: optim: curvefit_stat and fixed parameters


From: Olaf Till
Subject: Re: optim: curvefit_stat and fixed parameters
Date: Fri, 30 May 2014 23:42:43 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Fri, May 30, 2014 at 07:58:00PM +0200, Markus Appel wrote:
> Hello,
> 
> my goal is to calculate covp and corp for an optimization with
> nonlin_curvefit using curvefit_stat. After having some problems I
> tried to put together a minimal working example to reproduce the
> error (which may be a bug). I am not quite there yet, but
> encountered another problem:
> 
> The attached script uses nonlin_curvefit and curvefit_stat, one time
> with a parameter vector and another time with a parameter struct. I
> fit a polynomial with 3 parameters to some data, but added a 4th one
> on which the model function does not depend (for demonstration).
> Declare the 4th parameter fixed, and curvefit_stat (for parameter
> vector) gives:
> 
> >error: __dfdp__: product: nonconformant arguments (op1 is 4x1, op2 is 3x1)
> <snip>

Hello Markus,

that is surely a bug. I'll look into this tomorrow morning ... Olaf

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