topic SAS IML Create combinations in a Hash Table in SAS/IML Software and Matrix Computations

SAS IML Create combinations in a Hash Table

Sanscrit_2prov — Thu, 17 Oct 2019 11:53:03 GMT

Hi:

In SAS IML there is a function called ALLCOMB that can create a matrix of all possible combinations. This is a very helpful function but if the number of combinations is for n=large it doesn't work as well from an efficiency point of view. I was wondering if any one has created hash tables of all possible combinations to improve the efficiency. I know how to either use allcomb or do loops to create a matrix but instead I would like to create a Hash table lookup of the combinations in each row. Thanks

Re: SAS IML Create combinations in a Hash Table

PeterClemmensen — Thu, 17 Oct 2019 11:57:53 GMT

@Sanscrit_2prov welcome to the SAS Community 🙂

Can you provide a small example of your problem and where it goes wrong?

Re: SAS IML Create combinations in a Hash Table

Ksharp — Thu, 17 Oct 2019 13:28:23 GMT

Check GRAYCODE Function in data step.

I would not think Hash could contain so many combinations. and it must be exploded .