HP Prime crashes in Function and Graph 3D App.

[Joe Horn]

The purge command only purges CAS variables, not Home variables. If you create a Home variable called 'y', you can delete it in several ways:

1: DelHVars("y")
2: Vars, User, User Variables, then highlight y and backspace it (it will ask if you're sure).
3: Mem / User Variables / up / highlight y and backspace it (this method does not ask if you're sure).