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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