MathGroup Archive 1996

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error message

  • To: mathgroup at
  • Subject: [mg5057] error message
  • From: gt1824a at (Heather Mary Hauser)
  • Date: Wed, 23 Oct 1996 01:38:16 -0400
  • Organization: Georgia Institute of Technology
  • Sender: owner-wri-mathgroup at

In using FindRoot to find the zeros of a function which I have defined by a 
procedure (too long to list here), I keep getting the error message 
"FindRoot::frnum:Function{{-0.00004794 - 0.000020387I}} is not a length 1
list of numbers at {r} = {0.15I}" . r = 0.15I is the first of two values I 
give to start the search, because I know that there is not a symbolic 
derivative to be found. I also know that this value is near a possible zero
because it is midway through an interval where the function changes sign. 
(both real and imaginary parts). Can anybody tell me what this error message 
means ?

Heather Hauser
heather at

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