| T O P I C R E V I E W |
| bpbag |
Posted - 12/02/2010 : 08:22:44 AM
Hi,
I am unable to fit the non-linear curve with a user defined function. It is not initializing at all? Do I require any initialization of parameters? and How?
The function is
y=(a*(h+x+1/k)-sqrt((a^2)*(h+x+1/k)^2-4*h*x*a^2))/2
where X is the independent variable, Y is the dependent variable and a,h,k are the parameters. |
| 1 L A T E S T R E P L I E S (Newest First) |
| Shirley_GZ |
Posted - 12/02/2010 : 10:04:00 PM
Hi bpbag,
Yes, you need to initialize your parameters when you do fitting with a user-defined function. But if you create a new function in Fitting Function Builder in Origin 8.5, Origin will set the initial values of all parameters as "1" by defualt.
More details, please refer to parameter initialization.
Shirley
Originlab Technical Service Team |
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