Evaluate expression with HP50g

[Carsen]

Peacecalc is correct but here are a few things to simplify his method.

Instead of searching the catalog by pressing [Right Shift] [SYMB] for the function "Define", you can simply press the [left shift] button and then press the [ 2 ] button. It should say "DEF" above the [ 2 ] button in white text, which means define.

The second thing that Peacecalc was unclear about is you have to press the [VAR] button in order to see the "MYFUN" variable name.

The third thing I have to say is that you do not need to have flag 117 set. When pressing the [VAR] button, it is always a soft menu. Also, when using the Catalog, it is always a CHOOSE box. So flag 117 is irreverent in this problem.