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Re: estimation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg108617] Re: estimation
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Thu, 25 Mar 2010 04:26:30 -0500 (EST)

Certainly the following does it:

    z (-1/2 Exp[2 z] + 3/2 Exp[z])

But I suspect that's not really your question. Let me guess that you 
really have z = x + I y and you want to evaluate the expression in a way 
that collects the real and imaginary parts.  In that case:

    ComplexExpand[z (-1/2 Exp[2 z] + 3/2 Exp[z]) /. z -> x + I y]

On 3/24/2010 5:43 AM, Magdalena Moczydlowska wrote:
> Hi,
>
> Do you know how to estimate  z (-1/2 exp(2*z)+3/2*exp(z)) where z is a
> complex number  ( Re(z)<0).
>
> Thank You,
> Magdalena
>

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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