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

Keywords: macros, general, glm, variables
isfactor(arg) returns True if arg is a factor created by function
factor() and false otherwise.  If arg is underfined, isfactor() returns

isfactor(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 factor.

The principal use of isfactor() is in checking the arguments of a macro
for appropriateness.

See also topics factor(), 'models', 'glm', anova(), isarray(), ischar(),
isdefined(), isfunction(), isgraph(), islogic(), ismacro(), ismatrix(),
isname(), isnumber(), isnull(), isreal(), isscalar(), isstruc(),

Gary Oehlert 2003-01-15