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MathGroup Archive 2006

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Re: Solve Equation involving Error Function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65199] Re: Solve Equation involving Error Function
  • From: dh <dh at metrohm.ch>
  • Date: Fri, 17 Mar 2006 05:45:39 -0500 (EST)
  • References: <dvdih3$a3a$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Raj,
it is not quit clear what you want. For fixed values of t1 and t2 you 
get an answer from:

Solve[Erfc[x] == N[t2/t1], x]
or
InverseErfc[N[t2/t1]]

a least square solution to all values you get from:

fun[x_] := 2(Erfc[x] - 87/80)^2 + (Erfc[x] - 87/81)^2;
NMinimize[fun[x], x]

Daniel

rajanikanth at gmail.com wrote:
> hi!
> 
> Could somebody tell me how to solve this equation for the value of k in
> Mathematica
> 
> t2-t1*Erfc[0.0005/Sqrt[k]] ==0
> 
> where t2 is a list given by {87,87,87}
> and t1 is a list given by  {81,80,80}
> 
> Thanks,
> 
> Raj
> 


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