| T O P I C R E V I E W |
| Varanda |
Posted - 09/29/2015 : 3:18:08 PM
Origin Ver. 8 and Service Release SR0(Select Help-->About Origin):
Operating System:Windows XP
or
Origin Ver. 2015 and Service Release SR0(Select Help-->About Origin):
Operating System:Windows 8.1
I need fitting a Langevin function, in which one parameter must be firstly optimized by using a Lognormal distribution.
The complete equation is:
and the parameters to fit are: y0, Ms, d, A, w, b and c
Please, note that the variable is “x”, but the integral is related to “d”. Thus, d parameter must be previously optimized to be used in each interaction step.
Can you help me, please? |
| 3 L A T E S T R E P L I E S (Newest First) |
| lkb0221 |
Posted - 10/07/2015 : 3:04:25 PM
Maybe try this one?
http://www.originlab.com/doc/Tutorials/Fitting-Integral-NAG |
| Varanda |
Posted - 10/06/2015 : 4:04:40 PM
Hello jasonzhao,
Thank u for replay.
I used the mentioned turorial, bur the curve fit return that the great dependence of the variable. I use this script:
return (cosh(0.06108*(exp(ixc))^3*(ih+x))/sinh(0.06108*(exp(ixc))^3*(ih+x)))-1/(0.06108*((exp(ixc))^3*(ih+x))) * (iA * exp(-(ln(t/ixc))^2/(2*iw^2)) / (sqrt(2*PI)*iw*t));
with
Integration variable: t
Arguments: ixc, iw, iA, ih
Parameters: y0,xc,w,A,h,Ms,B
and the Function body is:
y0 + Ms*integral(MyIntegrand, 0.00001 ,+inf ,xc ,w ,A ,h)+B*x
Observing the expression that sent the first post, I'm making a mistake? At where?
Could you help me again? |
| jasonzhao |
Posted - 09/30/2015 : 02:00:13 AM
Hello,
You can refer to this tutorial:
http://www.originlab.com/doc/Tutorials/Fitting-Integral-LabTalk
Best regards!
Jason
OriginLab Technical Service |
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