[R] Help using spg optimization in BB package

[Ravi Varadhan]

You can try defining a "projection" function as follows:

	project <- function(x) x / sum(x)

This should work fine.  

Let me know if you have any trouble.

Ravi.


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Ravi Varadhan, Ph.D.

Assistant Professor, The Center on Aging and Health

Division of Geriatric Medicine and Gerontology 

Johns Hopkins University

Ph: (410) 502-2619

Fax: (410) 614-9625

Email: rvaradhan at jhmi.edu

Webpage:  http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html

 

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-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of dre968
Sent: Wednesday, April 22, 2009 8:23 AM
To: r-help at r-project.org
Subject: [R] Help using spg optimization in BB package


i'm trying to use the BB package to minimize the sum of the squared
deviations for 2 vectors.  The only thing am having trouble with is defining
the project constraint.  I got the upper and lower bounds to work but i am
not sure how to create a constraint that the sum of x must be 1.  Any help
would be greatly appreciated.  
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