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Re: Problem: is not a list of numbers with dimensions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg88492] Re: [mg88450] Problem: is not a list of numbers with dimensions
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 6 May 2008 06:44:25 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

In both cases, use Exp rather than exp

A = 1*10^(-4);
k = 2/3;
g = 1.12*10^(-11);
Attenuation = 0.23026*0.475*10^(-3);
L = 7200;
Leff = (1 - Exp[-Attenuation*L])/Attenuation;

FindRoot[x - A*Exp[k*g*x*Leff - Attenuation*L], {x, 0}]

{x->0.0000454986}


Bob Hanlon

---- Fikri Serdar GOKHAN <fsgokhan at gmail.com> wrote: 
> When run the below code,
> 
> 
> A=1*10^(-4);
> 
> k=2/3;
> 
> g=1.12*10^(-11);
> 
> Attenuation= 0.23026*0.475*10^(-3);
> 
> L=7200;
> 
> Leff=(1-exp[-Attenuation*L])/Attenuation;
> 
>  
> 
> FindRoot[x-A*exp[k*g*x*Leff-Attenuation*L],{x,0}]
> 
>  
> 
> It executes the below solution,
> 
>  
> 
> FindRoot::nlnum: The function value {0.-0.0001 exp[-0.787489+0. \
> 
> (1.+Times[<<2>>])]} is not a list of numbers with dimensions {1} at \
> 
> {x} = {0.}.
> 
>  
> 
> I need your help about numerical and Alpha_numeric solution of this problem.
> 
> 
>  
> 
> f(x)= x-A*exp[k*g*x*Leff-Attenuation*L
> 
>  
> 
> Serdar
> 
> 



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