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MathGroup Archive 2009

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FindRoot and evaluation control

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98485] FindRoot and evaluation control
  • From: LMZ <sashulika at gmail.com>
  • Date: Fri, 10 Apr 2009 04:59:03 -0400 (EDT)

Good day,

help me please with good advice about the problem below.
need to solve equation (Eigenvalues can not be calculated
symbolically):
FindRoot[x==Eigenvalues[hamiltonM/.{a->-103., b->600., j->75., jE-
>75., tau->x}][[1]],{x,-1}]

got errors:
"Eigenvalues::eival: Unable to find all roots of the characteristic
polynomial."

thanks for your help and time, Alexandr.


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