[Rd] eigen returns NAs from a real matrix
murdoch at stats.uwo.ca
Mon Mar 19 14:01:39 CET 2007
On 3/19/2007 6:48 AM, Martin Maechler wrote:
>>>>>> "BDR" == Prof Brian Ripley <ripley at stats.ox.ac.uk>
>>>>>> on Sun, 18 Mar 2007 06:51:58 +0000 (GMT) writes:
> BDR> On Sat, 17 Mar 2007, Spencer Graves wrote:
> >> Hi, All:
> >> Attached please find a symmetric, indefinite matrix for which
> >> 'eigen(...)$vectors' included NAs:
> >>> load("eigenBug.Rdata")
> >>> sum(is.na(eigen(eigenBug)$vectors))
> >>  5670
> >>> sessioninfo()
> >> Error: could not find function "sessioninfo"
> >>> sessionInfo()
> >> R version 2.4.1 (2006-12-18)
> >> i386-pc-mingw32
> >> locale:
> >> LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
> >> States.1252;LC_MONETARY=English_United
> >> States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
> >> attached base packages:
> >>  "stats" "graphics" "grDevices" "utils" "datasets" "methods" 
> >> "base"
> >> Using EISPACK does NOT return NAs: > sum(is.na(eigen(eigenBug,
> >> EISPACK=TRUE)$vectors))
> >>  0
> >> I traced the problem to the following line in 'eigen':
> >> z <- if (!complex.x)
> >> .Call("La_rs", x, only.values, PACKAGE = "base")
> >> Comments?
> BDR> Nothing appeared as an attachment.
> it was a zip file which is not among the allowed ones
> (.tar.gz / *.tgz would work).
> Spencer has also contacted me in private,
> so you now can use something like :
> F <- tempfile()
> download.file("ftp://stat.ethz.ch/U/maechler/R/eigenBug.Rdata", F)
This is unrelated to Spencer's problem, but this sequence failed for me.
By default it will treat the file as a text file, and convert EOL
markers for Windows. Adding "mode='wb'" to the download.file() call is
> str(eigenBug)# tons of dinames; get rid of them:
> M <- unname(eigenBug)
> # 0 (for MM, on Linux); '5670' for Spencer
I get the same as Spencer in 2.4.1, but zero in R-devel, in Windows. I
haven't tried R-patched yet: there were network problems here this
morning, and the build failed.
> sum(is.na(eigen(M, EISPACK=TRUE)$vectors))
> # 0
> ## Guess about what kind of BLAS/Lapack I'm using :
> file.info(list.files(R.home("lib"), full=TRUE))[,1:3]
> ## size isdir mode
> ## ....64-linux-inst/lib/libRblas.so 422558 FALSE 755
> ## ....64-linux-inst/lib/libRlapack.so 3144596 FALSE 755
> I.e. I don't get any NA's
> which shows to me that the bug is most probably in the Lapack -
> Version that Spencer's version of R is linked against.
> Martin Maechler, ETH Zurich
> R-devel at r-project.org mailing list
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