MathGroup Archive 1992

[Date Index] [Thread Index] [Author Index]

Search the Archive


  • To: mathgroup at
  • Subject: Eigensystem
  • From: billl at (Bill Lytton)
  • Date: Fri, 19 Jun 92 15:11:55 PDT

My report of a discrepancy between Eigensystem and Eigenvalues was wrong.
My error was in trying to equate the results of symbolic and numerical
calculations.  They differed in the arbitrary order given to the roots
of the characteristic eqn.  Therefore:

aa = {{-a1, b1,0},{a1,-(b1+a2),b2},{0,a2,-b2}}

bb = aa /. {a1->5.,b1->1.,a2->4.,b2->15.}

Eigenvalues[aa] /. {a1->5.,b1->1.,a2->4.,b2->15.} != Chop[Eigenvalues[bb]]


  • Prev by Date: Letters to the Editor
  • Next by Date: Re: Alias vs $PreRead
  • Previous by thread: Letters to the Editor
  • Next by thread: Math into ASCII