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 Semi-Cirlce Fit		  New Topic  Reply to Topic
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19102208

Germany
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Posted - 01/29/2014 :  09:28:56 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. 8

I want do fit data points with a semi-circle fit. Probably I have to define a new function, maybe something like:
y-yc= +/-sqrt(r^2-(x-xc)^2)

What do I have to fill in the dialogues? (Parameter Names, Function,Independent Variables etc).

Thanks for help.

referenceurs

USA
1 Posts
Posted - 01/29/2014 :  09:37:17 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
HELLO 19102208 PLEASE HELP ME
I HAVE A FONCTION TOO AND I NEED HELP
theta = pi * rand(100,1)
x = cos(theta) + 0.1 * randn(100,1)
y = sin(theta) + 0.1 * randn(100,1)
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zahraa

USA
52 Posts
Posted - 01/29/2014 :  10:22:58 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Dear Matthias and refereceurs,

To build a fitting function on your own you can use these resources:
http://www.originlab.com/Index.aspx?go=Support/VideoTutorials&pid=1172

http://www.originlab.com/www/helponline/origin/en/UserGuide/User-Defined_Fitting_Functions.html

If you are still having trouble with this, email us at
tech @originlab.com or post back on the forum and we can discuss it further.

Thanks
Zahra

Originlab Technical Representative
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zahraa

USA
52 Posts
Posted - 01/29/2014 :  3:49:42 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Matthias and refereceurs,
I just wanted to add that in order to these fits you would need implicit functions:
http://originlab.com/Index.aspx?go=Products/OriginPro&pid=1939

The implicit functions feature is in Origin 9.0 and above so you may consider upgrading.

Also Matthias, there is a built-in implicit Circle function in Origin 9.0 that can be used to conveniently fit semi circles without having to build your own.



Zahra

Originlab Technical Representative
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