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Re: equation solving in a markov model

• To: mathgroup at smc.vnet.net
• Subject: [mg75278] Re: equation solving in a markov model
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Mon, 23 Apr 2007 05:42:45 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <f09gse$16k$1@smc.vnet.net> <f0el5s$q5h$1@smc.vnet.net>

omur.tosun at gmail.com wrote:
> and i forgot to write my question...
> 
> i use x=D[A,Lambda(in)] then Solve[x==0,Lambda(in)] but couldn't find
> any solution.
> 
> it gives error massages like using inverse function or equations
> appear to involve the variables to be solved for in an essential non-
> algebric way ..
> 
> what am i doing wrong??
> 
> 

You could try *Reduce* and use assumptions and/or domain specification. 
For instance,

Reduce[D[A, Lambda[in]] == 0, Lambda[in]]
Reduce[D[A, Lambda[in]] == 0 && k > 0, Lambda[in]]
Reduce[D[A, Lambda[in]] == 0, Lambda[in], Reals]
Reduce[D[A, Lambda[in]] == 0 && 0 < k <= n && a > 0, Lambda[in], Reals]

(Note that in the above examples, the values I have used are just there 
to illustrate what you can do with *Reduce*. I have not tried to solve 
the equation.)

Regards,
Jean-Marc