| T O P I C R E V I E W |
| mongmara |
Posted - 07/31/2010 : 01:12:57 AM
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
I have tried to fit (x,y) data points using the model y=A*exp(B*x)+C using least square principle. I arrive at solving nonlinear system of equation
using Newton Method and/or Steepest descent method. For Newton Method the solution converges for some initial solution while, Steepest descent method, It doesn't converge. Anyone have any idea? Please help.
mongmara@gmail.com
Mong Mara |
| 3 L A T E S T R E P L I E S (Newest First) |
| Shirley_GZ |
Posted - 08/05/2010 : 11:17:59 AM
Hi,
To fit the model like y=A*exp(B*x)+C, please follow this tutorial page,
http://www.originlab.com/www/helponline/Origin/en/mergedProjects/Tutorial/Tutorial/User_Defined_Fitting_Function_using_OC.html
Thnaks,
Shirley
Originlab Technical Service Team |
| mongmara |
Posted - 08/04/2010 : 7:49:06 PM
You said I could fit the model. How Can I fit? Any idea or instruction?
Mong Mara |
| larry_lan |
Posted - 08/01/2010 : 10:04:30 PM
Hi:
The Origin fitter supports explicit function only. You can fit a model like y=A*exp(B*x)+C. However, implicit equations, like the equation you posted, cannot be solved in Origin.
Thanks
Larry |
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