Displaying 3 results from an estimated 3 matches for "eigenbugmatrix".
2003 Dec 01
0
eigen anomaly
...)
to produce NaN's in some of the returned eigenvectors.
This happens using SuSe 8.2 Professional and the precompiled
R rpm (happens in both 1.8.1 and 1.7.1). I don't see it under
Windows.
To reproduce the bug:
The matrix (75 by 75, about 45K) is in
http://www.burns-stat.com/pages/Flotsam/eigenbugmatrix.RData
Load that into R.
sum(is.na(eigen(eigenbugmatrix, symmetric=TRUE)$vectors))
is non-zero (600 in my experience) when the bug is exhibited and
is zero when the bug is not.
It is quite sensitive to the numbers. The bug is still there with some
scaling of the matrix (from about divide by 2 t...
2005 Jul 04
0
eigen of a real pd symmetric matrix gives NaNs in $vector (PR#7989)
...)
to produce NaN's in some of the returned eigenvectors.
This happens using SuSe 8.2 Professional and the precompiled
R rpm (happens in both 1.8.1 and 1.7.1). I don't see it under
Windows.
To reproduce the bug:
The matrix (75 by 75, about 45K) is in
http://www.burns-stat.com/pages/Flotsam/eigenbugmatrix.RData
Load that into R.
sum(is.na(eigen(eigenbugmatrix, symmetric=TRUE)$vectors))
is non-zero (600 in my experience) when the bug is exhibited and
is zero when the bug is not.
It is quite sensitive to the numbers. The bug is still there with some
scaling of the matrix (from about divide by 2 t...
2005 Jul 04
1
eigen of a real pd symmetric matrix gives NaNs in $vector (PR#7987)
Full_Name: cajo ter Braak
Version: 2.1.1
OS: Windows
Submission from: (NULL) (137.224.10.105)
# I would like to attach the matrix C in the Rdata file; it is 50x50 and comes
from a geostatistical problem (spherical covariogram)
> rm(list=ls(all=TRUE))
> load(file= "test.eigen.Rdata")
> ls()
[1] "C" "eW"
>
> sym.check = max(abs(C - t(C))) # should