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 Fitting with an Asymmetric Gaussian		  New Topic  Reply to Topic
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pb

Italy
8 Posts
Posted - 12/13/2006 :  08:39:52 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version: 6.0 or 7.5 SR1
Operating System: Windows XP Pro

Hi,
I need to fit some data with an asymmetric Gaussian profile.
I have tried defining my own function in the non linear curve fit panel,

if x<xc
y=(A1/(w1*sqrt(PI/2)))*exp(-2*((x-xc)/w1)^2);
else
y=(A2/(w2*sqrt(PI/2)))*exp(-2*((x-xc)/w2)^2);

however, there is discontinuity in xc. In the constraint panel I have tried imposing that the max of the two gaussians has to be the same

(A1/(w1*sqrt(PI/2)))=(A2/(w2*sqrt(PI/2)));

but the constraint was not accepted (may be it has to be linear?)

Could you please help me to solve this discontinuity problem?

Many thanks

paola

Mike Buess

USA
3037 Posts
Posted - 12/13/2006 :  09:13:32 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Paolo,

Tutorial 11 > Defining a New Fitting Function describes specifically how to define the Asymmetric Gaussian.

Mike Buess
Origin WebRing Member
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pb

Italy
8 Posts
Posted - 12/13/2006 :  12:17:32 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Many thanks Mike !
Paola
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SvenP

29 Posts
Posted - 08/26/2010 :  06:03:55 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:
Originally posted by Mike Buess

Hi Paolo,

Tutorial 11 > Defining a New Fitting Function describes specifically how to define the Asymmetric Gaussian.

Mike Buess
Origin WebRing Member
Where can I find this?
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