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curve-fittingxmgrace

How to fit and calculate the average for data sets in xmgrace?

I have a function which I like to fit it to a function of Y=a+(1-a)exp(-x/T) to get the T value for it.

I want to do these using Xmgrace but I do not know how.

Thanks for your suggestions.

Solution

  • On the xmgrace window, click Data Transformations Non-linear curve fitting.

    • On formula section, type in a0+(1-a0)*exp(-x/a1)
    • You have 2 parameters, a0 and a1. On parametes section, select 2. Make an inital guess, range, tolerance and number of iterations. Normally default values would suffice for tolerance and iterations.
    • Hit Apply. Keep on hitting it untill a good fit is obtained.

    Note - A good guess of initial parameters will help you get a good fit faster.