| T O P I C R E V I E W |
| chmonster |
Posted - 05/03/2013 : 09:08:13 AM
Origin Ver.: 8 SR4
Operating System: Windows 7
Hi all.
I'm newbie to the Origin and have a problem with writing User-Defined Fit Function. So I will by very happy, if somebody can help me with that.
I have an experimental data - fluorescence spectrum, which I want to fit with polynomial function like that:
y = a*(poly 1) + b*(poly2) + c*(poly3);
This function contains 3 polynomial of 5th power and 3 parameters. It's suppose, that after fitting I must obtain values of these parameters, so I can know what contribution have each of three polynomial to my spectrum.
And there is a condition, that a+b+c=1
I can fit my data with such a function, but parameters values don't converge with conditions (i.e a+b+c>1)
How can I include these equation (a+b+c=1) to my function??
Please help..
(P.S. i'm sorry, if such subject has already been discussed, but I can't find answer using forum search yet) |
| 4 L A T E S T R E P L I E S (Newest First) |
| chmonster |
Posted - 05/06/2013 : 04:17:10 AM
Many Thanks! |
| ZanHUNG |
Posted - 05/06/2013 : 04:00:55 AM
You can enable general linear constraints when defining a fitting function in Fitting Function Organizer.
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| chmonster |
Posted - 05/04/2013 : 04:38:42 AM
Solve the second question, find "update" button://
Please, help with the first one |
| chmonster |
Posted - 05/03/2013 : 5:25:04 PM
And one more question:
When I fit data on my graph, I obtain a fitting results table right on my graph, containing some parameters. (I think that is what called "Output report")
If I have several datasheets on my graph, so after fitting there are NOT several tables with results, but just one, with parameters changing after each fit operation.
What I want - that I have as much result tables on my graph, as many times I've done fitting operation (i.e. 3 datasheets on graph - 3 times make fitting - 3 fitting result tables on graph)
Does somebody know, how to solve that problem?
Thanks
And sorry for my bad english |
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