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alextrv
3 Posts |
 Posted - 12/04/2014 : 10:15:42 AM
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Origin Ver. and Service Release (Select Help-->About Origin):9.0.0 32bit
Operating System: Windows 7
Hello,
im quite new in building the scripts, however i'm trying to perform NL fitting of the complex curve like exponential grow first and then exponential decay. For this purpose i'm using two equations. Initially, i want to complete fitting of the first part of curve and then use fitting result values to continue fitting with the second part of curve.
I tried to apply getnlr function, but it didn't work.
Generally it could look like:
nlbegin aa Association tt mode:=cons;
tt.Aeq
tt.Kobs
nlfit;
nlend 1 1;
getnlr tt iw:=[Book1]FitNL1! p:=1;
tt.Aeq=; tt.Kobs=; // get these values
nlbegin bb Dissociation tt mode:=cons;
tt.Aeq // use value from the previous fit
tt.Kobs // use value from the previous fit
tt.Kdiss // new parameter
nlfit;
nlend 1 1;
Maybe someone can give me an idea how to complete this script?
Thanks,
Alex
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lkb0221
China
497 Posts |
Posted - 12/09/2014 : 10:21:53 AM
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Hi,
I think it will make more sense to built a user-defined fitting function.
Zheng
OriginLab |
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alextrv
3 Posts |
Posted - 12/10/2014 : 04:15:11 AM
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Hi, thanks for the answering. Yes, you are right I've already tried to build two user defined functions. I will briefly describe them.
To make a fitting of the first part of curve i have to use the following function1 (Association):
y = Aeq * ( 1 - exp(- Kobs *t), where
t is independent parameter,
and Kobs, Aeq(Equivalent Signal) - parameters to be determined.
Once i get the values for these parameters , i have to use them for another fitting of the 2nd part of curve (function2 Dissociation):
y2 = Astop* exp( -Kdiss* ( t - Tstop ) );
where Astop = Aeq * ( 1 - exp(- Kobs *Tstop) ).
So, my question is how can i modify my script to get these Kd and Aeq values from function1 and use them automatically in the function2?
Thank you,
Alex |
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lkb0221
China
497 Posts |
Posted - 12/10/2014 : 11:16:10 AM
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Hi,
I've already built a fitting function according to the infos you provided, and it looks working as expected for my fake data.
Would you mind send a real sample data to <tech@originlab.com> so I can test the function further?
And please also provide your serial number in the email.
Zheng
OriginLab |
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sol708
USA
2 Posts |
Posted - 08/07/2015 : 4:47:44 PM
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Hey,
I am doing some curve fitting similar to the description below .
Can you provide the script ?
To make a fitting of the first part of curve i have to use the following function1 (Association):
y = Aeq * ( 1 - exp(- Kobs *t), where
t is independent parameter,
and Kobs, Aeq(Equivalent Signal) - parameters to be determined.
Once i get the values for these parameters , i have to use them for another fitting of the 2nd part of curve (function2 Dissociation):
y2 = Astop* exp( -Kdiss* ( t - Tstop ) );
where Astop = Aeq * ( 1 - exp(- Kobs *Tstop) ).
So, my question is how can i modify my script to get these Kd and Aeq values from function1 and use them automatically in the function2?
quote:
Originally posted by lkb0221
Hi,
I've already built a fitting function according to the infos you provided, and it looks working as expected for my fake data.
Would you mind send a real sample data to <tech@originlab.com> so I can test the function further?
And please also provide your serial number in the email.
Zheng
OriginLab
SOLOMON |
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Topic |
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Using of the NL fit result in the next NL fitting