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is_coordsys - Function

	Package	general
	Module	images

Is this variable a Coordsys tool ?

Synopsis
is_coordsys(thing)

Arguments

thing	in	Variable to test
		Allowed:	Glish variable
		Default:	None

Returns
T or F

Description

Determine if this variable is a Coordsys tool. This is very useful in scripts; for robustness, you check that the tool is a Coordsys tool before you start applying Coordsys tool functions.

Example

cs := coordsys();
is_coordsys(cs)
T
cs2 := 'doggies'
is_coordsys(cs2)
F