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rainbowkoala
29 Posts |
 Posted - 03/31/2014 : 05:18:13 AM
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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:
In nonlinear fitting, my user defined function is complicated. When I replace part of the user defined function with a letter, the user defined function will be concise. For example, an equation is given as follows.
y=a*sin(d*atan((x*b)^c*cos(3.14/(2*(1-c)))
ind. variables: x
dep. variable: y
parameters: a,b,c,d
When I replace "atan((x*b)^c*cos(3.14/(2*(1-c))" with a letter A , the user defined function will be concise as y=a*sin(d*A).
How can I replace part of the user defined function with a letter?
I just tried in Fitting Function Organizer. It did not work.
please find more details in the insert image.
Thanks for your help.
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Edited by - rainbowkoala on 03/31/2014 05:19:08 AM |
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SeanMao
China
288 Posts |
Posted - 03/31/2014 : 06:13:31 AM
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Hi,
You certainly can do that. However, before you can use A as the replacement, you have to define A as a function and then define your y in terms of A. It is shown in the figure below how you can do that:
Regards!
Sean
OriginLab Tech Service |
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rainbowkoala
29 Posts |
Posted - 03/31/2014 : 10:43:18 AM
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Hi Sean,
Thank you for the response. I got it.
It works!
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Replace part of user defined function with letter