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 serious problem during exponential decay fitting		  New Topic  Reply to Topic
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marostyle

S. Korea
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Posted - 02/18/2008 :  10:35:34 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): Origin pro 7.5
Operating System:windows XP

Hello, all
I have a big problem during exponential decay fitting.
I carried out exponential decay fit, but only linear fit line presented. However other exponenetial fit function has no problem.
I think datas are not bad.
It seems may system error but I don't know why this problem happnen.
please help me.

fit error image attached bottom.

thanks a lot.

Fay_Guo

China
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Posted - 02/19/2008 :  03:15:28 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

From your attached image, I see there are only 5 values in your dataset. While there are 5 parameters in the function of ExpDec2, so some values cann't be computed.
Could you add your sample size and do exponential decay fitting again?

If you have any problems, please feel free to contact with us.

Thanks
Fay
Originlab Technical Service
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marostyle

S. Korea
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Posted - 02/19/2008 :  05:34:39 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you for your answer.

I confused between ExP2PMod2 and ExpDec2 for an instant.
(although other data, not this sample)

Thank you, and sorry for my stupid mistake.
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