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 fitting errorfunction to data		  New Topic  Reply to Topic
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hydrix

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Posted - 04/10/2007 :  12:03:42 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System:XP
hi;
is it possible to fit the errorfunction (something like y=P1*(1-erf(x/P2)) where P1 and P2 are the fitting parameters) to a dataset?
and if yes how?
thank you

Mike Buess

USA
3037 Posts
Posted - 04/10/2007 :  12:27:27 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
See this topic on fitting with error function...
http://www.originlab.com/forum/topic.asp?TOPIC_ID=4326

See Help > Tutorials > Tutorial 11 for instructions on how to create a fitting function.

Mike Buess
Origin WebRing Member
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hydrix

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Posted - 04/11/2007 :  06:08:27 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
quote:

See this topic on fitting with error function...
http://www.originlab.com/forum/topic.asp?TOPIC_ID=4326

See Help > Tutorials > Tutorial 11 for instructions on how to create a fitting function.

Mike Buess
Origin WebRing Member


hello,
i tried as you said , but when i compile the origin c file the reply is:
C:\Dokumente und Einstellungen\Administrator\Anwendungsdaten\OriginLab\Origin75E\User Files\OriginC\NLSF\_nlferf.fit(40) :Error, function or variable erf not found
nag_erf does not work too.
so where do i find the nag_erf programme ?
thanks
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Mike Buess

USA
3037 Posts
Posted - 04/11/2007 :  08:12:47 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Try to compile the function below. If it does not compile then you need to update your Origin 7.5. (Latest version is SR6.) If it does compile then you are using erf or nag_erf incorrectly in your fitting function.

void test_erf(double x)
{
out_double("erf(x)=",erf(x));
out_double("nag_erf(x)=",nag_erf(x));
}

Mike Buess
Origin WebRing Member
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