| T O P I C R E V I E W |
| 73659 |
Posted - 02/18/2006 : 10:49:21 PM
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! |
| 2 L A T E S T R E P L I E S (Newest First) |
| Shikha |
Posted - 05/22/2013 : 1:30:11 PM
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 |
| easwar |
Posted - 02/19/2006 : 12:19:51 PM
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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