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pazmush
14 Posts |
 Posted - 12/17/2008 : 7:09:08 PM
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Hi, i need to fit a function of the form
y(x,t)= ((a*exp(-t/b))/(sqrt(4*pi)*sqrt(c)*(t+b)))*(exp(((-(x-d*e*t)^2)/(4*c*(t+b))))
but i don't really have a clue how to do it, can anybody help?
(a,b,c,d,e are the parameters)
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pazmush
14 Posts |
Posted - 12/17/2008 : 7:43:12 PM
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actually this makes more sense
y = h*(exp(-a*x))*(1/((b*(x+(1/a)))^0.5))*(exp((-(c-(d*x))^2)/(b*(x+(1/a)))))
what do i do with the parameters?
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pazmush
14 Posts |
Posted - 12/17/2008 : 9:34:15 PM
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right ive managed to set some initial parameters which give me a nice looking plot in simulate but i can,t get it to fit this curve to my graph.
Any ideas? |
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VincentLiu
China
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Posted - 12/18/2008 : 01:06:29 AM
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Hi Pazmush,
Do you mean you have defined the fitting function and cannot get a good result when you fit data with this function? If in this case, could please send you data and the .fdf (It is the file type of user defined fitting function, you can find it in your User Files Folder\ FitFunc folder.) You can send then through
http://www.originlab.com/www/company/qform.aspx?s=1&
Best regards,
Vincent
Origin Technical Services
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Transient function fitting?