Tests the input for being a scalar value and checks the
class of the scalar. This function is meant to be used
internally for function input argument verification
and typically will not be used otherwise.
Usage
checkScalarType(x, isType="numeric")
Value
no output is returned. If these tests fail, a stop condition
is executed.
Arguments
x
an S-PLUS object.
isType
a character string defining the class of the
object to be checked ala is(x,isType). Default: "numeric".