| T O P I C R E V I E W |
| linamaho |
Posted - 03/09/2009 : 2:34:59 PM
Hello
I've been trying to make a custom fit by using the following equation y = A+ B*cos(2x), but after defining the new function in the fitting function organizer nothing appears when I say that makes the fit. On the other hand, could you tell me how I define the initial values of my parameters?
Thank you. |
| 3 L A T E S T R E P L I E S (Newest First) |
| Echo_Chu |
Posted - 06/22/2009 : 01:35:08 AM
Hi,
Please look at following tutorial of how to fit with user-defined functon.
http://wiki.originlab.com/~originla/howto/index.php?title=Tutorial:User_Defined_Fitting_Function_using_OC
Have you got any error message when you fit your data? Best you can provide us your fdf file and sample data so that we can look into it.
You can send it by guidelines in this page
http://www.originlab.com/index.aspx?s=1&lm=123&pid=752
Echo
OriginLab Corp
|
| Femtosecond15 |
Posted - 06/19/2009 : 2:19:23 PM
Hello,
I would like to fit a function with a user-defined equation. The formula I want to use is called hyperbolic secant. Here is the formula:
y = A*(2/exp(x-x0)+exp(-x+x0))^2
I did everything exactely as described in the fitting tutorial but when I try to fit my data nothing happens. I can fit e.g. a Gaussian on the data. So the data itself are ok.
Does anyone know where the problem might be?
Thanks a lot. |
| Deanna |
Posted - 03/09/2009 : 11:16:41 PM
Hi,
Please read the following section and the help file of the Fitting Function Organizer:
http://www.originlab.com/www/helponline/Origin8/en/regression_and_curve_fitting/user-defined_fitting_functions.htm#InitParams
Deanna
OriginLab Technical Services |
