| T O P I C R E V I E W |
| rainbowkoala |
Posted - 09/28/2013 : 08:34:52 AM
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 |
| 2 L A T E S T R E P L I E S (Newest First) |
| rainbowkoala |
Posted - 10/05/2013 : 03:36:47 AM
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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| Shirley_GZ |
Posted - 09/30/2013 : 06:33:27 AM
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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