Function definition, replacement and deletion is similar to that in the
spectral line data reduction (SPA) program. Functions are defined by typing
the function name followed by a space, an equal sign, another space, and the
string of commands to be carried out
by the function. Thus, the command:
PETE = REF START CAL START MAP
defines a function which will move the telescope to the reference position,
start the CAL program, and when CAL is finished, start the MAP program. The
function definition, including function name and equal sign, can be no longer
than eighty characters. Function names may be any length (
80
characters), but
as with other keywords, only the first four letters of the command are used by
the computer for comparisons. These first four letters must not duplicate any
of the standard tracking program keywords, and if an existing user defined
function has these same first four letters, then it will be replaced by the
new command string.
To delete a function, type its name, a space, an equal sign, and a
carriage return. Thus, to delete the function PETE that was defined above,
type:
PETE =
and PETE will be removed from the function list. A special command, CLFN.
exists to delete all 20 user named functions so that new ones may be added.