Test whether a Crunch object belongs to a class
is.VariableDefinition(x)is.VarDef(x)
is.script(x)
is.dataset(x)
is.CrunchExpr(x)
is.Expr(x)
is.Geodata(x)
is.shoji(x)
is.variable(x)
is.Numeric(x)
is.Categorical(x)
is.Text(x)
is.Datetime(x)
is.Multiple(x)
is.MR(x)
is.MultipleResponse(x)
is.CA(x)
is.CategoricalArray(x)
is.NumericArray(x)
is.Array(x)
an object
logical