[R] Catching error messages (from nls(), e.g.)

[Thomas Hoffmann]

I try to fit subsequentially different nonlinear models to data.
Up to now I tried a first model and if I could not fit this one
proceeded to another one.

Now I would like to handle this automatically. But much to my
chagrin I did not find a way for dealing with the error messages
from nls(), e.g. getting them as "control information" or at least
just returning from nls() without a model.

Is there a simple way to handle this?


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Thomas Hoffmann, Institut fuer Halbleiter- und Mikrosystemtechnik, TU Dresden 
E-mail: hoffmann at ehmgs2.et.tu-dresden.de
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