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73659

USA
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Posted - 02/18/2006 :  10:49:21 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin):
Operating System:Windows XP

Does Origin "recognize" the Digamma function (a special function)? If not, how to define it in Origin?

Thanks!

easwar

USA
1964 Posts
Posted - 02/19/2006 :  12:19:51 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Looking at this page:
http://mathworld.wolfram.com/DigammaFunction.html
the Digamma function is same as Polygamma?

In Origin 7/7.5, the NAG numeric library has a special math function called nag_real_polygamma and also a nag_complex_polygamma. You can look those up and they can be accessed from Origin C, as well as from script in Origin 7.5 (the real_polygamma, go to script window and type list_nag_sf).

You can look up function details in the Programming help file under the topic:
Origin C Langauge Reference->Global Functions->NAG Functions

Easwar
OriginLab
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Shikha

1 Posts
Posted - 05/22/2013 :  1:30:11 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I am trying to fit an expression in Origin Lab 8.0, however I got stuck.
I am defining an equation as " s=a*((real_polygamma((0.5+(Bi/B)),1))-(real_polygamma((0.5+(Bt/B)),1))-(ln(t/ti)))"
While compiling this equation i got the error that "function not found"
Could you please help me out?

Thanks!
Shikha
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