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zsigy

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Posted - 10/25/2005 :  5:14:58 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5 SR1
Operating System: WinXP

Is Origin able to do complex nonlinar fitting on functions of complex numbers?

If yes, could one explain me how does it work?

Istvan Gy. Zsely

Leo_Li

China
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Posted - 10/27/2005 :  03:46:24 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
With a little work you can do nonlinear fitting on a function of complex numbers:

Assume your function is in the form of y = f(z), in which, the independent variable z = a + bi;

Convert the function to: y = g(a, b), so you have two indepents a, b;

Don't know how to fit a function with multiple independents? Please check:

http://www.originlab.com/index.aspx?s=9&pid=434

Leo
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zsigy

.
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Posted - 10/28/2005 :  03:39:12 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Dear Leo,

Yes, this is a possibility and thank you for the link, but some functions of us are not easy-to-convert ones.

For example Z(w) = P0 +(P1/(iw)^(1/2))coth[P3(iw)^(1/2)]
+(P2/(iw)^(1/2))tanh[P3(iw)^1/2]

Has somebody any other idea?

Istvan Gy. Zsely
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minimax

351 Posts
Posted - 08/29/2008 :  05:27:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Istvan,

You may take a look at this post to check if it would help you:

http://www.originlab.com/forum/topic.asp?TOPIC_ID=7296

Max
OriginLab Technical Support
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