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 multiple independent variables in nlbegino		  New Topic  Reply to Topic
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phyo

Germany
1 Posts
Posted - 03/29/2017 :  08:35:00 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 64Bit b9.3.226
Operating System: Windows 7 Pro

My question is similar to the one discussed here:

http://www.originlab.com/forum/topic.asp?TOPIC_ID=7865

but I have a newer version of Origin, so the workaround suggested in that thread does not work.

Briefly, I would like to fit data in column 2 (type y) with a linear combination of columns 4 and 5 (both type x). I have created a user-defined function in the Fitting Function Builder with two independent variables (a and b), one dependent variable (f), and two parameters (C1 and C2). The function is f = C1*a + C2*b. The function works using manual data selection with Nonlinear Implicit Curve Fit, but I am not able to run the function in my script:

nlbegino iy:=(4,5,2) func:=UseReference nltree:=tt;
Returns the error: "Please select at least one XYRange."

Does anyone have advice? Thanks so much!

yuki_wu

896 Posts
Posted - 03/29/2017 :  11:54:24 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

First of all, I will suggest you to redefine your fitting function as an explicit function with multiple independent variables instead of an implicit function. You should take a look at this tutorial:
http://www.originlab.com/doc/Tutorials/Fitting-MultiIndepVar

Next, use the nlbeginr X-function in your case:
http://www.originlab.com/doc/X-Function/ref/nlbeginr

Hope it helps.

Regards,
Yuki
OriginLab
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