| T O P I C R E V I E W |
| cchun1999 |
Posted - 07/06/2023 : 05:19:04 AM
Hello, I have some problems with HLN fitting.
My formula as shown below (Labtalk script):
psi_deriv=real_polygamma(x,k)
k=1
y=(A*1.23314709*10^-5)*(real_polygamma(0.5+1.64557041*10^(-16)/(x*L^2),1)-ln(1.64557041*10^(-16)/(x*L^2)))
However, when I try to evaluate, the caption says "x, y, A, L not used."
And when I insist to keep fitting, the caption says "Fit did not converge, and reason unknown"
So, I want to know how to deal with this problem, thank you! |
| 5 L A T E S T R E P L I E S (Newest First) |
| cchun1999 |
Posted - 07/06/2023 : 12:31:33 PM
Hi, James
Thank you very much for your help.
I found that the issue was with the version.
When I used Origin 2019, this equation was executable.
Chun |
| cchun1999 |
Posted - 07/06/2023 : 12:01:10 PM
Yes, I set independent variables=x, dependent variables=y, and parameters=A, L on the previous page.
My Origin version is 9
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| YimingChen |
Posted - 07/06/2023 : 10:23:58 AM
Then the equation should evaluate properly. Did you specify the independent vars, dependent vars, and parameters on the previous page?
 |
| cchun1999 |
Posted - 07/06/2023 : 10:18:09 AM
Yes!
My equation:
y=(A*1.23314709*10^-5)*(real_polygamma(0.5+1.64557041*10^(-16)/(x*L^2),1)-ln(1.64557041*10^(-16)/(x*L^2))) |
| YimingChen |
Posted - 07/06/2023 : 10:12:37 AM
You only need the third line of LabTalk script as the equation, right?
James
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