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rainbowkoala

29 Posts

Posted - 03/09/2014 : 10:10:10 AM

Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8.5.0 SR1
Operating System: win7
Hello,
I hope you can help me with the following problem:
I want to define an Origin C fitting function which involves three integral. For example, y=integ(A1+B1x)+integ(A2+B2x)+integ(A3+B3x)
Lower Limit: -inf, Upper Limit: inf, integration variable: x, Parameters: A1/B1/A2/B2/A3/B3
I looked for the Origin help. But Origin allows user to define an Origin C fitting function which involves only one integral.
http://wiki.originlab.com/~originla/howto/index.php?title=Tutorial:Fitting_with_Integral_using_LabTalk_Function
Thanks for your help.

Sam Fang

292 Posts

Posted - 03/10/2014 : 04:01:45 AM

We have another tutorial to show how to fit with two integrals using LabTalk functions.
http://www.originlab.com/doc/Tutorials/Fitting-2Integral-LabTalk

Note that fitting integral using LabTalk function is only available in Origin8.6 or higher version.

In Origin8.5, you have to use OriginC code to call NAG functions for integrals, e.g. example in the page:
http://www.originlab.com/doc/Tutorials/Fitting-Integral-NAG

Sam
OriginLab Technical Services

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