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How to extract the numerical value of a dynamical variable?

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Hello
Could you please help me with following?

How can I get a real number (and not an expression) from a dynamic variable in "manipulate"? (my aim is to use that value in another function as "NonlinearModelFit"

Have a look at this example:

Lini = 1.95;
SumStart = 2750.; SumStop = 3100.;
{Manipulate [ Plot[ {Exp[-(2.97018 10^6 - 4481.87021 [Omega] + 2.53689 [Omega]^2 - 6.38403*10^-4 [Omega]^3 + 6.02659*10^-8 [Omega]^4) * L*10^-4]} , {[Omega], SumStart, SumStop}, PlotRange -> {0, 1}, GridLines -> Automatic, PlotStyle -> {{Red, Thickness[0.004]}}] , {{L, L0}, 0.0, 20, Appearance -> "Labeled"} (* =E9paisseur d'eau en microm=E8tres*) , LocalizeVariables -> False , Initialization -> {(L := Lini)} ] , {L0 = Dynamic[L] // N}; }

If I type (when the cursor's value is put on 13.1) :

In[1]= 5 + L0 + 0.1

I get:

Out[1]= 5.1 + 13.1

a mathematical expression!

I am looking for the corresponding real number 18.2 corresponding to the present value of the cursor!!!
How to get it?

Thanks for your help
Christian

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How to extract the numerical value of a dynamical variable? xan.mar.cm@gmail.com - 2014-04-09 08:14 +0000
  Re: How to extract the numerical value of a dynamical variable? David Reiss <dbreiss@gmail.com> - 2014-04-10 07:09 +0000

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