[gmx-users] stretched exponential

[Ramachandran G]

Dear gromacs users:
         I have a couple of questions:

         While doing auto correlation function under what condition i need
to use polynomials?
          Apart from the fit functions existing in the gromacs how can i use
different functions like
stretched exponential in the form  P(t)=exp((-t/tau)**b)) to fit the data?

Your help would be highly appreciated.
Thank  you.
Rama
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