# [Rd] eigen broken on AIX with R-devel? (PR#537)

**Thomas J Vogels
**
Thomas Vogels <tov@ece.cmu.edu>

*15 Jun 2000 13:57:55 -0400*

Hi, I ran the test again with the newly released version of R (1.1) and I
now get the correct eigen values. ("make check" succeeds.)
The scary part is that I think that I also used gcc+f77 last time and
the libs weren't changed. Maybe the scary part is that I think...
So the comments that this is compiler specific probably hold.
Thanks,
-tom
tov@ece.cmu.edu writes:
>* Hi, I get the wrong eigen values on an AIX machine with R-devel of 5/3/00.
*>*
*>* Here are the results:
*>*
*>* R> m <- matrix (c(6.8, 2.4, 2.4, 8.2), nrow=2)
*>* R> m
*>* [,1] [,2]
*>* [1,] 6.8 2.4
*>* [2,] 2.4 8.2
*>* R> eigen(m)
*>* $values
*>* [1] 19.281403 6.337993
*>*
*>* $vectors
*>* [,1] [,2]
*>* [1,] 0.1918866 0.9967987
*>* [2,] 0.9967987 -0.1918866
*>*
*>*
*>* And for comparison, here is what I get on a Sun (with r-stable):
*
(same results now on AIX 4.3 with R 1.1.0
>* R> m <- matrix (c(6.8, 2.4, 2.4, 8.2), nrow=2)
*>* R> eigen (m)
*>* $values
*>* [1] 10 5
*>*
*>* $vectors
*>* [,1] [,2]
*>* [1,] 0.6 0.8
*>* [2,] 0.8 -0.6
*
--
mailto:tov@ece.cmu.edu (Tom Vogels) Tel: (412) 268-6638 FAX: -3204
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