FORGET QUANTITY @name
Once a quantity has been defined with the NEW QUANTITY command, you can not
accidently corrupt its definition. To remove a quantity, you must tell PERCY
to forget its definition. This is accomplished with the FORGET command.
If you simply want to overwrite the definition of a quantity, use the NEW! QUANTITY command.
If you are in the habit of producing a standard report for various objects
you might create a PERCY command procedure for defining it. In such a case
the FORGET REPORT and FORGET QUANTITY commands would be used at the beginning
of the report definition. Below illustrates how you might use symbols to
define this standard report. Note we "protect" most of the commands to avoid
possible symbol definition conflicts.
;
; This report assumes that the symbols OBSERVER and BODY have
; been defined.
;
@FORGET QUANITYT TIME@;
@FORGET QUANTITY RA@;
@FORGET QUANTITY DEC@;
@FORGET QUANTITY ELONGATION@;
@FORGET REPORT STANDARD@;
@NEW QUANTITY TIME DESCRIPTION TIME FORMAT UTC HEADING Time@;
@NEW QUANTITY ELONGATION DESCRIPTION ELONGATION OF@ BODY
@FROM@ OBSERVER
@FORMAT XXXX.XXXX
UNITS DEGREES
HEADING Elongation@;
@NEW ENTRY RA DESCRIPTION J2000 RIGHT ASCENSION
OF@ BODY
@FROM@ OBSERVER
@FORMAT XXXX.XXXX
UNITS DEGREES
HEADING R.A.@;
@NEW ENTRY DEC DESCRIPTION J2000 DECLINATION OF@ BODY
@FROM@ OBSERVER
@FORMAT XXXX.XXXX
UNITS DEGREES
HEADING Dec.@;
@NEW REPORT STANDARD ENTRIES TIME ELONGATION RA DEC@;