Services & Resources / Wolfram Forums / MathGroup Archive

MathGroup Archive 2012

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

Search the Archive

InverseZTransform numerical issue on some expression, version 8.0.4

  • To: mathgroup at
  • Subject: [mg126784] InverseZTransform numerical issue on some expression, version 8.0.4
  • From: "Nasser M. Abbasi" <nma at>
  • Date: Thu, 7 Jun 2012 05:20:02 -0400 (EDT)
  • Delivered-to:
  • Reply-to: nma at

Using 8.0.4 on windows 7

InverseZTransform[1/(0.9512294245007143 -1.9512294245007142  z+z^2),z,n]

does NOT generate an answer.  But

InverseZTransform[1/(0.9512294245 -1.9512294245 z+z^2),z,n]

does. I simply chopped few digits (kept removing one digit
at a time until it worked)


In order to get a result since I had a feeling it is a numerical

screen shot

question is: Is this due to numerical issue? and
how to better handle this whole thing. Clearly what I did
above is not what I would do all the time. May be I am
missing an option or something else. Because in a larger
program, I would need to make sure InverseZTransform
worked all the time or a way to check if it did not work.


  • Prev by Date: Re: Converting from string to real
  • Next by Date: Re: Memory Blowup Issues
  • Previous by thread: Re: please help using NDSolve and FindFit
  • Next by thread: Re: FindDistributionParameters