User-Written DATA Step Functions

For years, users have asked for the ability to write functions in DATA step syntax. The day has come when this is possible. In SAS®9, the FCMP procedure provides the ability to write functions using DATA step syntax. In SAS® 9.2, these functions can be called from a DATA step. This paper explains how to write functions with PROC FCMP and how these functions are invoked from a DATA step. It also contains caveats when calling PROC FCMP functions from a DATA step.

Paper: 

Jason Secosky - User Written DATA Step Functions.pdf