| T O P I C R E V I E W |
| Mikey123 |
Posted - 02/14/2006 : 10:50:41 AM
Origin Version (Select Help-->About Origin): 7.5
Operating System: Win XP
Hi
I'm trying to fit 3 lorentz peaks to an experimental plot. Through theory I know the relative intensities of the peaks. Is there a way to related the 3 peaks so that the area's can depend upon each other.
i.e. A1=[variable]; A2=6*A1; A3=9*A1.
Thanks
Mike |
| 1 L A T E S T R E P L I E S (Newest First) |
| easwar |
Posted - 02/14/2006 : 2:11:17 PM
Hi Mike,
You can specify constraints in the advanced NLSF curve fitting tool.
If you are performing the multiple lorentzian fit from the Analys->Filt Multi-peaks->Lorentzian menu item, at the end of the process press CTRL-Y to bring up the NLSF dialog. Go to the Options->Constraints page in the tool and enter your constraint:
A2=6*A1; A3=9*A1;
Make sure to check the "Enabled" check box and then proceed to Action->Fit page to fit with this constraint in place. You can then click Done once the fit converges to get the new result etc.
Easwar
OriginLab
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