Re: ANN: Ada 2005 Math Extensions 20120712

[Simon Wright <simon@pushface.org>]

Ada novice <shai.lesh@gmx.com> writes:

> When running "demo_extensions", I saw some differences in the outputs
> (in the last example for instance).

The last example comes from
http://www.nag.co.uk/lapack-ex/node122.html. The results
(http://www.nag.co.uk/lapack-ex/examples/results/zggev-ex.r) look a lot
more like the Debian output you list than the ACML output.

FWIW the Mac OS X 10.7.4 output is

ZGGEV example at http://www.nag.co.uk/lapack-ex/node122.html

Eigenvalue( 1) = ( 3.00000E+00,-9.00000E+00)
Eigenvector( 1) = ( 8.37379E-01, 1.62621E-01)( 1.53495E-01,-7.44663E-02)( 7.44662E-02, 1.53495E-01)(-1.53495E-01, 7.44663E-02)
Eigenvalue( 2) = ( 2.00000E+00,-5.00000E+00)
Eigenvector( 2) = (-6.29583E-01,-3.70417E-01)(-4.14824E-03, 4.65175E-04)(-3.95739E-02,-2.32833E-02)( 2.32834E-02,-3.95739E-02)
Eigenvalue( 3) = ( 3.00000E+00,-1.00001E+00)
Eigenvector( 3) = ( 9.77535E-01, 2.24653E-02)( 1.59101E-01,-1.13710E-01)( 1.20898E-01,-1.53710E-01)( 1.53710E-01, 1.20898E-01)
Eigenvalue( 4) = ( 4.00000E+00,-5.00000E+00)
Eigenvector( 4) = ( 9.06236E-01,-9.37645E-02)( 7.43045E-03,-6.87512E-03)(-3.02078E-02, 3.12552E-03)( 1.45859E-02, 1.40970E-01)

which has similar absolute values but the signs of all except (3) are
reversed; and are the same as the outputs of the NAG test program/data.

I'm not a numerical analyst, so I have no idea whether these differences
represent bugs or features.