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alex99
Germany
2 Posts |
 Posted - 09/26/2018 : 04:28:46 AM
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Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Helle everybody,
I want to build a used defined function that can use two independent variable to calculate the value of y.
I did it with the "Equation_type" and the test was successful, but when i try to use it to fit my data it dont work. They use the variable separatly for the calculation.
How can i make it work? Im now making important calculation for my PhD.
Func: y = (A/ß)exp(-Ea/RT) where ? ß and T are the independent Variable
Thanks!
Alex
Alex.K |
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Hideo Fujii
USA
1582 Posts |
Posted - 09/26/2018 : 11:25:14 AM
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Hi Alex
I'm not sure, but can you try to use e.g. B or sz, instead of ß? Variable or parameter name may have to be English alphabets.
--Hideo Fujii
OriginLab |
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alex99
Germany
2 Posts |
Posted - 09/27/2018 : 03:33:54 AM
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quote:
Originally posted by Hideo Fujii
Hi Alex
I'm not sure, but can you try to use e.g. B or sz, instead of ß? Variable or parameter name may have to be English alphabets.
--Hideo Fujii
OriginLab
The problem is not the alphabet i change it to F at the function builder it work properly with given parameter. I think the Problem is to choose the F data during the fit so that the function calculate the Y during the fitting.
I can send you my file if you want
Alex.K |
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Hideo Fujii
USA
1582 Posts |
Posted - 09/27/2018 : 10:16:51 AM
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Hi Alex
Sure, please send the FDF file of your function in the fitfunc subfolder in your User Files Folder,
and a sample Origin file which contains a sample data and the report of the failed fitting result,
to tech@originlab.com , mentioning this forum post.
--Hideo Fujii
OriginLab |
Edited by - Hideo Fujii on 09/27/2018 10:18:03 AM |
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Topic |
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Non linear fitting with two independant variable