topic Re: BesselK Function in SAS for Non integer Orders in SAS Programming

BesselK Function in SAS for Non integer Orders

gaurangmehta — Wed, 08 Mar 2017 19:43:14 GMT

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

Re: BesselK Function in SAS for Non integer Orders

Ksharp — Thu, 09 Mar 2017 03:11:48 GMT

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

Re: BesselK Function in SAS for Non integer Orders

gaurangmehta — Thu, 09 Mar 2017 08:14:19 GMT

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

Re: BesselK Function in SAS for Non integer Orders

Ksharp — Thu, 09 Mar 2017 10:09:13 GMT

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

Re: BesselK Function in SAS for Non integer Orders

gaurangmehta — Thu, 09 Mar 2017 12:40:42 GMT

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

Re: BesselK Function in SAS for Non integer Orders

SanjayNursing — Thu, 09 Mar 2017 14:18:26 GMT

Hi Gaurang,

You can access the SAS Ballot ideas here:

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

Regards Sanjay