RE: [R] Linear system

From: Doran, Harold <HDoran_at_air.org>
Date: Wed 25 May 2005 - 22:49:14 EST


Yes, solving systems of linear equations is a strength of R and is very easy. Doug Bates has a nice article in a prior version of R News showing optimal methods for doing this in R. Here is an example using your data:

X <- matrix(c(353,45,29,45,29,3,29,3,4), ncol=3) y <- c(79,5,8)

solve(crossprod(X))%*%crossprod(X,y)

See Doug's article at the following link:

http://cran.r-project.org/doc/Rnews/Rnews_2004-1.pdf

-----Original Message-----

From: r-help-bounces@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Jim Gustafsson Sent: Wednesday, May 25, 2005 8:31 AM
To: r-help@stat.math.ethz.ch
Subject: [R] Linear system

Dear R-help

I have a problem solving a linear system like

353a+45b+29c=79
45a+29b+3c=5

29a+3b+4c=8

Is there any way of doing this in R?

Best Regards
Jim




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