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 how to use this fitting fuctions		  New Topic  Reply to Topic
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cgbin

Albania
Posts
Posted - 09/28/2004 :  08:49:14 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5 trial ver.
Operating System:windows2000
I use my own fitting fuctions for Non-linear curve fitting. but i do not know how to use these functions(insert images).Is there a way to input these functions(equations) into Origin ?so that I am able to work on it.
Thank you !
cheng

easwar

USA
1965 Posts
Posted - 09/28/2004 :  09:57:05 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Cheng,

The erf() function is available in Origin C and so as long as you define your fitting function using Origin C, you will be able to fit with it. Also, the NAG library that is included in Origin 7/7.5 has nag_erf() and nag_erfc() functions which could be used as well.

The key to using such functions is that the proper include file needs to be present in the Origin C function definition - otherwise the function will not compile. Please see the discussion at the end of the following post for how to change the include file:
http://www.originlab.com/forum/topic.asp?TOPIC_ID=3383

As for fitting with integrals, you can do that with Origin C function as well - will need to compute the sum, such as in the example at the end of the following post:
http://www.originlab.com/forum/topic.asp?topic_id=2586

Easwar
OriginLab
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cgbin

Albania
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Posted - 09/28/2004 :  7:34:06 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hey Eashwar & Mike,
Thanks very much!!!!!!!!!!!
cheng
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