[R] Matrix multiplication precision
Steve Lianoglou
mailinglist.honeypot at gmail.com
Wed Jul 15 16:27:53 CEST 2009
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
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