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MathGroup Archive 1997

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N and NSolve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg7300] N and NSolve
  • From: C L C Fu <es2136 at eng.warwick.ac.uk>
  • Date: Fri, 23 May 1997 01:41:29 -0400 (EDT)
  • Organization: University of Warwick, UK
  • Sender: owner-wri-mathgroup at wolfram.com

Hello folks

I am a bit confused with N and NSolve.

I sued NSolve to solve a  qubic equations. It gave me three real numerical
solution.  However, when I used Solve to solve the same solution
symbolicly, it gave me three roots in symbolic form and when I used N to
solve the roots numerically, it gave me three solution in complex forms.
The  real parts are the same in both cases.  

The solutions are  in the first case:

{{Cp -> -8.104589570312425*^-8}, {Cp -> 2.522495922927543*^-8},
  {Cp -> 4.500002377739561*^-8}}


The second case:

{{4.500002377739564*^-8 + 1.52201232709757*^-22*I},
  {-8.104589570312425*^-8 + 2.977850205190899*^-23*I},
  {2.522495922927541*^-8 - 1.720535674110297*^-22*I}}

Why is that?

Thanks

Col



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