Q: Eigen values in Mathematica 2.2

*To*: mathgroup at smc.vnet.net*Subject*: [mg4022] Q: Eigen values in Mathematica 2.2*From*: wojtek at amedec.amg.gda.pl (Wojciech Piotrowski)*Date*: Mon, 20 May 1996 02:13:48 -0400*Organization*: Akademia Medyczna w Gdansku*Sender*: owner-wri-mathgroup at wolfram.com

Why Mathematica 2.2 can't find Eigen values for some matrices? When I use the earlier version ( 2.1 ) there is no problem like that. For example: Amat={{1,2},{-2,-3}}; Eigenvalues[Amat] And version 2.2 displays message: can't find all roots of charactristic polynomial, but v.2.1 answers: {-1,-1} This no matters when I want to find only Eigen values, because I can find it solving characteristic polynomial for instance, but Mathematica use Eigenvalues function in JordanDecomposition which I often use. wojtek at amedec.amg.gda.pl ==== [MESSAGE SEPARATOR] ====