Displaying 3 results from an estimated 3 matches for "matrixfactorizations".
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matrixfactorization
2011 Sep 01
1
Newer Matrix Factorization Techniques
...am not sure if this should go to r-help or r-dev list. I have looked
at some archives of R libraries but cannot seem to see a project that
focuses on the new matrix factorization techniques that are showing up
in the literature. I have made a list of them:
https://sites.google.com/site/igorcarron2/matrixfactorizations
they include Robust PCA, Dictionnary Learning, Sparse PCA and are
mostly implemented in Matlab. What is most interesting is that even
though they share the same names with techniques already listed in
some R libraries, they really are implementing very different
algorithms that perform better.
H...
2012 Apr 20
3
PCA sensitive to outliers?
Hi all,
I found that the PCA gave chaotic results when there are big changes in a
few data points.
Are there "improved" versions of PCA in R that can help with this problem?
Please give me some pointers...
Thank you!
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2009 Mar 10
5
Cholesky Decomposition in R
Hi everyone:
I try to use r to do the Cholesky Decomposition,which is A=LDL',so far I
only found how to decomposite A in to LL' by using chol(A),the function
Cholesky(A) doesnt work,any one know other command to decomposte A in to
LDL'
My r code is:
library(Matrix)
A=matrix(c(1,1,1,1,5,5,1,5,14),nrow=3)
> chol(A)
[,1] [,2] [,3]
[1,] 1 1 1
[2,] 0 2 2