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MathGroup Archive 1996

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InverseFunction problem

  • To: mathgroup at
  • Subject: [mg5537] InverseFunction problem
  • From: Pedro Santos <psantos at>
  • Date: Thu, 19 Dec 1996 01:02:34 -0500
  • Organization: Sprint Internet Passport
  • Sender: owner-wri-mathgroup at

Can someone help me with this?
       Consider  the function f[x_]:=x/(1-x), clearly the inverse of
 this function is F[x_]:=x/(1+x). 
 How do I get a numerical result for F[x] when f[x] is a more
In the above example F[2.1]=0.677419, but 
              InverseFunction[f[2.1]]//N=   (-1.90909)
 Am I doing something wrong? I want to make sure I can find a numerical
 result before I use this for a more complex task.
 Can someone help?
 Please reply via e-mail to psantos at
 Thanks in advance.
 pedro santos..

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