DOSUBS with binary operations

[Joe Horn]

(05-15-2022 11:56 AM)Thomas Klemm Wrote:  ... This surprised me since I wasn't aware that the frame index could be omitted.
... Please excuse my ignorance but is this behaviour described in the manuals?

Yes, the following is in the DOSUBS section of the 50g's Advanced User's Reference Manual:

HP Wrote:The real number n can be omitted when the first argument is one of the following:
• A command.
• A user program containing a single command.
• A program with a user-defined function structure.
• A global or local name that refers to one of the above.