[R] nlm / fscale

Stephane Pezennec spezenne at labtechno.roazhon.inra.fr
Thu Nov 14 16:34:22 CET 2002

Dear all,

I am using the nlm(base) function for a simple least squares problem.

The size (order of magnitude) of the minimized function near the final 
parameter set is normally about 1e-10. Using the fscale=1e-10 argument in 
nlm is inefficient (no minimization is performed, iterations=0 or 1). Nlm 
only works when the minimized function is multiplied by 1e10 (without 
changing the default fscale).

Why? How should I use the fscale arg?


Stéphane Pezennec
65, rue de St Brieuc
CS 84215
35042 Rennes, France

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