Invokes PPLUS to execute a command or commands. "PLOT PLUS" was originally written by Don Denbo, but PPLUS within Ferret includes numerous changes from the original.
PyFerret runs PPLUS commands just as Ferret does, with the exception of text handling. If SET TEXT has been is issued in PyFerret with a font other than HERSHEY, text from Python library fonts is used.
yes? PPLUS !(also PPL); invokes PPLUS interactively or yes? PPL pplus_command !executes a single PPLUS command or 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, included in this manual as Appendix B.
Command Qualifiers for PPLUS:
Restores PPLUS to start-up settings.