PROC FCMP: Add support for optional parameters (without using arrays)

[ChrisNZ]

SAS Institute-supplied functions allow optional parameters:

  A=substr(B,2);

It would be very useful that custom-built functions have the same ability.

[Casey_SAS]

Chris,

  Thanks for the idea -we're considering this for a future release

[ChrisNZ]

That's awesome @Casey_SAS .

Proc FCMP has so much potential, but a few shortcomings let it down.