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 Nonlinear Curve Fitting		  New Topic  Reply to Topic
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taobonbon

Vietnam
2 Posts
Posted - 06/05/2014 :  09:54:20 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
OriginPro 8,Win7 32bits

Hello,

I am trying to fiting 5 parameters based on the following equation. However, the curve fitting is not good. How can I solve this problem, please?

y =a1*(x/a2*exp(a3/298))^a4*1/sinh((x/a2)*exp(a3/298))^a5

where: a1,...,a5: fit parameters
x: independen variable
y: dependent variable

For example: x = [4.02E-6, 4.02E-5, 4.02E-4]
y = [49.0, 55.5, 59.5]

Please help me.

Thanks in advance.

bang

lkb0221

China
497 Posts
Posted - 06/05/2014 :  12:10:01 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Can you provide a little more data points?
Three might not be able to make a fit...

Please send your data to <tech@originlab.com>.

Zheng
OriginLab
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taobonbon

Vietnam
2 Posts
Posted - 06/06/2014 :  05:56:45 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Zheng,

I sent you an email. Please check.

Thank you so much.
quote:
Originally posted by lkb0221

Hi,

Can you provide a little more data points?
Three might not be able to make a fit...

Please send your data to <tech@originlab.com>.

Zheng
OriginLab


bang
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