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 Non-linear fitting used for simple equation		  New Topic  Reply to Topic
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mikelee2

S. Korea
2 Posts
Posted - 02/26/2003 :  06:34:17 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi, everyone. I'm writing here because I have some question.

I have to find several variables and given equation is like this

y = 1 - exp(-A*x^B), so i would like to know the value of "A" and "B"

on my data. But I cannot use non-linear curve fitting method.

Please help me

easwar

USA
1964 Posts
Posted - 02/26/2003 :  09:05:16 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Are you having problems defining this equation in the nonlinear fitter and then using it to fit your data? Please be more specific.

Easwar
OriginLab.
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mikelee2

S. Korea
2 Posts
Posted - 02/26/2003 :  9:07:15 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Sorry, I forgot more specific contents. I have to fit and find variables "A" and "B" using equation as follows; y = 1 - exp(-A*x^B) type. But built-in equaions do not have above type of equation. And to make user defined equation is hard to me.
Can you make the user-defined equation or edited function for me?

Sincerely yours.
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easwar

USA
1964 Posts
Posted - 02/27/2003 :  09:31:27 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:

And to make user defined equation is hard to me.
Can you make the user-defined equation or edited function for me?


Hi,

You will need to create a fitting function (.FDF) file. The producedure for this is documented in the product. If you need further help, please contact your local technical support office for help.

Easwar
OriginLab.
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