Displaying 2 results from an estimated 2 matches for "katsikis".
2012 Dec 12
3
R-2.15.2 changes in computation speed. Numerical precision?
Speaking of optimization and speeding up R calculations...
I mentioned last week I want to speed up calculation of generalized
inverses. On Debian Wheezy with R-2.15.2, I see a huge speedup using a
souped up generalized inverse algorithm published by
V. N. Katsikis, D. Pappas, Fast computing of theMoore-Penrose inverse
matrix, Electronic Journal of Linear Algebra,
17(2008), 637-650.
I was so delighted to see the computation time drop on my Debian
system that I boasted to the WIndows users and gave them a test case.
They answered back "there's no ben...
2012 Dec 05
1
Understanding svd usage and its necessity in generalized inverse calculation
...ood as, but faster than, svd.
It appears to me work on this traces back to a speedup obtained by
Courrieu, whose method takes about one-half as much time as the svd.
P. Courrieu. Fast Computation of Moore-Penrose Inverse matrices.
Neural Information
Processing-Letters and Reviews, 8:25?29, 2005.
Katsikis, Casilos N. and Dimitrios Pappas. 2008. Fast computing of the
Moore-Penrose Inverse Matrix. Electronic Journal of Linear Algebra 17:
637-650.
http://celc.cii.fc.ul.pt/iic/ela/ela-articles/articles/vol17_pp337-350.pdf
Toutounian, F., & Ataei, A. (2009). A new method for computing
Moore-Penrose...