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rainbowkoala
29 Posts |
 Posted - 09/28/2013 : 08:34:52 AM
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Origin Ver. and Service Release (Select Help-->About Origin): OriginPro 8.5.0 SR1
Operating System: win7
I typed the following eqn to use as user defined and find the 3 unknown parameters,(a,b,c)
y =(1/2)*a*sin(b*3.14/2)/(cosh(b*(ln(x*c)))+cos(b*3.14/2))
It compiles, but my function do not converge.
Then I draw a specified plot using following the parameters:
a=2, b=0.8, c=0.08. That is
y=(1/2)*2*sin(0.8*3.14/2)/(cosh(0.8*(ln(Col(B1)*0.08)))+cos(0.8*3.14/2)).
I did NLfitting use the defined eqn. Parameters a,b,c are properly initialized (a=2, b=0.8, c=0.08.). I specified bounds on the parameters: 1<a<3, 0<b<1, 0.07<b<0.08.
My function do not converge at all.
Please find more details in the insert image.
The original data is in the attachment.
Thanks for your help.
http://www.originlab.com/ftp/forum_and_kbase/Images/user defined function.ogw |
Edited by - rainbowkoala on 09/28/2013 08:36:04 AM |
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Shirley_GZ
China
Posts |
Posted - 09/30/2013 : 06:33:27 AM
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Hi,
Sorry, I failed to download your data, please send the data to tech@originlab.com and quote this post.
Thanks,
Shirley
Originlab Technical Service Team |
Edited by - Shirley_GZ on 09/30/2013 06:33:56 AM |
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rainbowkoala
29 Posts |
Posted - 10/05/2013 : 03:36:47 AM
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Hi Shirley,
Thank you for the response. The data has been sent to tech@originlab.com.
Please find more details in the email.
quote:
Originally posted by Shirley_GZ
Hi,
Sorry, I failed to download your data, please send the data to tech@originlab.com and quote this post.
Thanks,
Shirley
Originlab Technical Service Team
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NL fit with user defined eqn did not converge