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inverse laplace transform problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33222] inverse laplace transform problem
  • From: "david Xia" <xiaxd at hotmail.com>
  • Date: Sat, 9 Mar 2002 03:20:02 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello,

   Does anybody know how to use Mathematica4.1 to get the following inverse 
laplace transform?
   I have 8 parameters, a,b,c,d,w1,w2,w3,w4. (Where there is a constrain 
that a+b+c+d=1)

   The following is the script I tried.
-------------------------------------------------------------
   f4s=aw1/(s+a)+bw2/(s+b)+cw3/(s+c)+dw4/(s+d)
   fi=f4s/(1-f4s)
   InverseLaplaceTransform[fi,s,t]
----------------------------------------------------------------
   I tried to run it, but mathematica runs for ever and can not give me an 
answer.

   Thanks for your help!

David


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