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2003 Apr 21
2
piece wise functions
...wn.
Is there anything in R for that?
I have tried to use nonlinear (nls package)
regression, "forcing" with the "nls" function the shape of the surface,
but it does not work.
By the way, the cofficients A_i have to be positive, but I suppose this is
another question.
Thanks
Casiano
casiano at ull.es