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ram42

UK
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Posted - 03/25/2004 :  10:41:44 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Further to my original question (pasted below). I have used the user defind fitting functions, however you are limited to a finite number of characters doing this. All of the examples in the help files and multimedia support are either simple functions, or small functions. The function I require to insert is of the form:

const*Summation(S*(S+1)*exp(E(S))/summation(S*exp(E(S))

where the summation is over S and E(S) (a function of S) which are listed in a worksheet separate to the main one (ie the one which we are trying to fit data with).

How to tackle this problem is not at all obvious with the helpfiles/instruction manuals/etc.

Cheers
Richard

Original Problem:
I am trying to learn how to use origin C to define my functions for use in the NLSF. I cannot find an example of one to use, are there any? The code I want to write is to fit a very large summation which calls information from another sheet within my origin project.

Laurie

USA
404 Posts
Posted - 03/28/2004 :  10:04:17 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Richard,

I'm not sure that you're exceeding the character limitation in the function definition text box. Please click here to read more about this limit.

Please look at this post, Sum in fit function, for help on how to use a summation.

Hope this helps,
Laurie



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