BesselK Function in SAS for Non integer Orders

[gaurangmehta]

Hi All,

We are trying to see if anyone has implemented BesselK (modified BesselK function of the 2nd kind) for non-integer orders.  Is there any way to calculate it from the available SAS functionality? It would be great if you can help here. Most statistical packages like R and MATLAB have got it but SAS does not have it.

Regards,

Gaurang Mehta

[Ksharp]

You can check this blog. and contact with @Rick to confirm if it existed.

http://blogs.sas.com/content/iml/2015/05/20/nuclear-bessels.html

[gaurangmehta]

Hi KSharp,
The key issue is ibessel function does not calculate the function value for negative orders. To calculate Besselk we need the ibessel values for negative orders.
Unfortunately the ibessel is not implemented properly in SAS.
Regards,
Gaurang Mehta

[Ksharp]

Yeah. I see. Maybe you could issue a ballot and ask SAS to create such an function.

[gaurangmehta]

Hi Ksharp,
How can I do that? Is there a process that I can follow?
Regards,
Gaurang Mehta

[SanjayNursing]

Hi Gaurang,

You can access the SAS Ballot ideas here: 

https://communities.sas.com/t5/SASware-Ballot-Ideas/idb-p/sas_ideas

Regards Sanjay