[R] lm with rank-deficient X matrix

[Lorenz Gygax]

Dear all,

I would like to fit an lm in which a subset of the explanatory variables
are linearly dependent. Thus I would like to include the restriction that
all betas of these variables sum to 1. Is there a way to this in R? Or is
this what happens automatically if I set singular.ok= T (which is the
default, I believe)? 

Thanks for your help. Lorenz
--			~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lorenz Gygax		 LGygax at amath.unizh.ch;       room: 36-L-40
			 Department of Applied Mathematics
			 University of Zuerich-Irchel
			 Winterthurerstr. 190; CH-8057 Zurich
			 voice: 41-1-635-58-52  fax: 41-1-635-57-05
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