Invokes PPLUS ("PLOT PLUS" written by Don Denbo), to execute a command or commands.
yes? PPLUS !(also PPL); invokes PPLUS interactively
yes? PPL pplus_command !executes a single PPLUS command
yes? PPL/RESET !restores PPLUS to start-up defaults
yes? PPL CROSS 1 !reference line through zero
Executes the PPLUS command "CROSS" and immediately returns control to Ferret.
When PPLUS is invoked interactively the prompt is "PPL>" instead of the usual "yes?". The EXIT command given at the "PPL>" prompt returns control to Ferret.
See the chapter "Customizing Plots" for more information on Ferret/PPLUS interactions. A complete list of PPLUS commands is in PLOT PLUS for Ferret User's Guide.
Command Qualifiers for PPLUS:
Restores PPLUS to start-up settings.