regression constraints?

gday R gurus,

I have a multivariate regression for which I want to constrain the
coefficients to be > 0.  Is this possible?

I've check the doco and searched CRAN but can't find anything.

thanks,
John Strumila

I've been doing something like that (regression coefficients
constrained 
to be > 0 and also forced to sum to 1) using the quadratic
programming program solve.QP in package quadprog. 

    Adam Gehr
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