[R] NLS "Singular Gradient" Error

Gabor Grothendieck ggrothendieck at gmail.com
Wed Apr 28 17:37:35 CEST 2010

Maybe you are applying a completely inappropriate model such as would
be the case if Ne/No is not strictly between 0 and 1.  All we can do
is guess  unless you provide a reproducible example which means that
if we paste it in from your post it will give the same errors you see.

aa means aa, not a*a.

On Wed, Apr 28, 2010 at 10:08 AM, bsnrh <bsnrh at leeds.ac.uk> wrote:
> No success means that I was not successful in changing the outputed error. It
> had no effect on the model.
> Thank you for your suggestions;
> The first returns this error;
> "Error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) :
>  NA/NaN/Inf in foreign function call (arg 4)"
> I don't understand your reasoning behind the second suggestion, but assuming
> you mean "a*a*Ne + b*b" and not "aa*Ne + bb" the following error occurs;
> "Error in numericDeriv(form[[3L]], names(ind), env) :
>  Missing value or an infinity produced when evaluating the model"
> Many thanks,
> --
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