From r.hankin at noc.soton.ac.uk  Tue Jan 10 13:53:44 2006
From: r.hankin at noc.soton.ac.uk (Robin Hankin)
Date: Tue, 10 Jan 2006 12:53:44 +0000
Subject: [Rd] eigen()
Message-ID: <3B7754B8-4982-49BE-B424-A0D9CFC6F056@soc.soton.ac.uk>

Hi

I am having difficulty with eigen() on   R-devel_2006-01-05.tar.gz

Specifically,  in R-2.2.0 I get expected behaviour:


 > eigen(matrix(1:100,10,10),FALSE,TRUE)$values
[1]  5.208398e+02+0.000000e+00i -1.583980e+01+0.000000e+00i
[3] -4.805412e-15+0.000000e+00i  1.347691e-15+4.487511e-15i
[5]  1.347691e-15-4.487511e-15i -4.269863e-16+0.000000e+00i
[7]  1.364748e-16+0.000000e+00i -1.269735e-16+0.000000e+00i
[9] -1.878758e-18+5.031259e-17i -1.878758e-18-5.031259e-17i
 >


The same command gives different results in the development version:


 > eigen(matrix(1:100,10,10),FALSE,TRUE)$values
[1]  3.903094e-118 -3.903094e-118 -2.610848e-312 -2.995687e-313  
-2.748516e-313
[6] -1.073138e-314 -1.061000e-314 -1.060998e-314  4.940656e-324    
0.000000e+00
 > R.version()
Error: attempt to apply non-function
 > R.version
                _
platform       powerpc-apple-darwin8.3.0
arch           powerpc
os             darwin8.3.0
system         powerpc, darwin8.3.0
status         Under development (unstable)
major          2
minor          3.0
year           2006
month          01
day            04
svn rev        36984
language       R
version.string Version 2.3.0 Under development (unstable) (2006-01-04  
r36984)
 >


Note the strange magnitude of the output.

[
I need this to work because one of my packages fails under R-devel
]


--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743



[Rd] eigen()
Robin Hankin