[R] least square fit with non-negativity constraints for absorption spectra fitting

From: Xu, Xiuli (NIH/NHLBI) [E] <xux3_at_nhlbi.nih.gov>
Date: Wed 12 Jul 2006 - 08:12:32 EST


I would really appreciate it if someone can give suggestions on how to do spectra fitting in R using ordinary least square fitting and non-negativity constraints. The lm() function works well for ordinary least square fitting, but how to specify non-negativity constraints? It wouldn't make sense if the fitting coefficients coming out as negative in absorption spectra deconvolution.

Thanks.

Xiuli



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