Hi Douglas,
And the big lesson, of course, is the first rule of numerical linear algebra., "Just because a formula is written in terms of the inverse of a matrix doesn't mean that is a good way to calculate the result; in fact, it is almost inevitably the worst way of calculating the result". You only calculate the inverse of a matrix after you have investigated all other possible avenues for calculating the result and found them to be fruitless.
As a relative noob to the nitty gritty details of numerical linear algebra, could you elaborate on this a bit (even if it's just a link to a book/reference that explains these issues in more detail)?
Where/what else should we be looking to do that would be better? Or are there really no general rules, and the answer just depends on the situation?
Thanks, -steve -- Steve Lianoglou Graduate Student: Physiology, Biophysics and Systems Biology Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
