First loop through columns and then loop through through rows

[Jass_Banga]

Thanks @Ksharp , now the error is 

ERROR: (execution) Invalid subscript or subscript out of range.

Additionally, how can change the IML code to caculate z value for each observation (more like the IML equivalent of "diff" command in OPTMODEL?

[Jass_Banga]

I have IML. 

[Ksharp]

Try free version SAS.

https://welcome.oda.sas.com/login

[Jass_Banga]

Thanks Ksharp. My problem is that if most of my group friends also don't have Proc Optmodel, thats why I would be very thankful if you guys can help me with the code in SAS IML.

Regards,

Jass 

[Ksharp]

Sorry. I have no time. Maybe @Rick_SAS could write it for you .