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crmda
2012 Dec 12
3
R-2.15.2 changes in computation speed. Numerical precision?
...the script output with R-2.15.0, shows no speedup from the
KPginv algorithm
http://pj.freefaculty.org/scraps/profile/prof-puzzle-1-Windows.Rout
On the same machine, I updated to R-2.15.2, and we see the same
speedup from the KPginv algorithm
http://pj.freefaculty.org/scraps/profile/prof-puzzle-1-CRMDA02-WinR2.15.2.Rout
After that, I realized it is an R version change, not an OS
difference, I was a bit relieved.
What causes the difference in this case? In the Amelia code, they try
to avoid doing the generalized inverse by using the ordinary solve(),
and if that fails, then they do the generalize...