[R] Linear Models with positive coefficients?

[Bill Simpson]

I don't think nnls.fit is available in R.

I would guess the way to do it would be to use a nonlinear optimizer that
allows constraints on the search space. R has a nonlinear optimizer called
nlm, but it does an unconstrained search. (nlm is just a standard routine
from netlib I think that is glued onto R. It would be nice to have a
nonlin optimizer with constraints, and several exist at netlib and
elsewhere; perhaps someone with the need for it and the knowledge of how
to do it will glue one onto R)

Bill

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