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 fitting a rotated gaussian surface		  New Topic  Reply to Topic
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jospector

8 Posts
Posted - 02/09/2009 :  3:42:05 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 8.0 SR4
Operating System: XP


Hi all,
I've got two sets of data, each of which should fit to a gaussian. I'd like to fit them together to a surface as that will save time. The problem is that they need to be fit to a rotated gaussian. My fit function is:

z = z0 + A*exp( -0.5*( ( (x*cos(theta)-y*sin(theta))-(xc*cos(theta)-yc*sin(theta)) )/w1)^2 -0.5*( ( (x*sin(theta)+y*cos(theta))-(xc*sin(theta)+yc*cos(theta)) )/w2)^2 ) ;


but it seems to never converge..is there a better way to do this?
My data represent the positions of a particel over time. The purpose of the rotation is to coincide the axis with the "long" direction of the trajectory...

thanks,
-js-

Deanna

China
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Posted - 02/10/2009 :  01:36:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Would you please send your data and the definition file (.fdf file) of the fitting function to us? With your data and function, we can do some test to see what happens.

Please read the following instructions on how to send files to OriginLab:
http://www.originlab.com/index.aspx?s=1&lm=123&pid=752

Deanna
OriginLab Technical Services
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jospector

8 Posts
Posted - 02/10/2009 :  9:20:29 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
submitted it today.
The file attachments wouldn't' let me use a .fdf so I made it a .txt file instead..
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