eigenvalues, part: fell off the end

   From: Yury Tarasievich <yury.tarasievich at gmail.com>

   Hi guys,

   On Maxima 5.30/linux/amd64, I'm getting this 
   with fairly simple block-diagonal symbolic 
   matrix of 10x10 and/or 11x11 dimension:

   E:eigenvalues(opH)
   part: fell off the end.

   But with matrix of dimension 9x9 and lower the 
   routine completes okay.

   What could/should I try? Should I post the 
   matrix in the form it's 'print'ed, too?

   The alt_eigen solution recommended earlier in 
   this list can't pass its own tests on 5.30.

   Is there anything else?

Yury, have you tried

p : charpoly(opH,x);

?

You likely have a factor in p that is of degree >4.

Leo