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isgraph(arg1 [, arg2, ...])

Keywords: macros, general, variables
isgraph(arg) returns True if arg is a GRAPH variable and False
otherwise.  If arg is undefined, isgraph() returns False.

isgraph(arg1, arg2, ..., argk) returns a LOGICAL vector, each element of
which is True or False depending on whether or not the corresponding
argument is a GRAPH variable.

The principal use of isgraph() is in checking the arguments of a macro
for appropriateness.  See argvalue() for another way to check for the
properties of macro arguments.

See also topics 'graphs', 'macros', isarray(), ischar(), isdefined(),
isfactor(), isfunction(), islogic(), ismacro(), ismatrix(), isname(),
isnumber(), isnull(), isreal(), isscalar(), isstruc(), isvector().

Gary Oehlert 2003-01-15