Re: BesselK Function in SAS for Non integer Orders

gaurangmehta · Posted 03-08-2017 02:43 PM

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 · Posted 03-08-2017 10:11 PM

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 · Posted 03-09-2017 03:14 AM

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 · Posted 03-09-2017 05:09 AM

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

gaurangmehta · Posted 03-09-2017 07:40 AM

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

SanjayNursing · Posted 03-09-2017 09:18 AM

Hi Gaurang,

You can access the SAS Ballot ideas here:

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

Regards Sanjay

BesselK Function in SAS for Non integer Orders