Inverse of a six-parameter asymmetric sigmoidal curve
- To: mathgroup at smc.vnet.net
- Subject: [mg111178] Inverse of a six-parameter asymmetric sigmoidal curve
- From: spiceman <aspiess at uke.de>
- Date: Fri, 23 Jul 2010 07:08:48 -0400 (EDT)
does anybody have a clue how to get Mathematica to deliver the inverse of the following function?
fct := c + (k * Log[x]) + (d - c)/(1 + Exp[b*(Log[x] - Log[e])])^f
Solve[fct == y, x]
Solve::tdep: The equations appear to involve the variables to be solved for in an essentially non-algebraic way.
I suppose I have to transform somehow. Any clues?
Omitting k*Log[x] works...
Thnaks in advance,
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