An internal function that evaluates the data item supplied as an argument to determine whether its value is a valid numeric value. If the data item is numeric, the function returns the value one, which is the logical value of true. If the data item is not numeric, the function returns the value zero, which is the logical value of false.
The IsNumeric internal function evaluates the data item supplied as an argument to determine whether its value is a valid numeric value. If the data item is numeric, the function returns the value 1, which is the logical value of true. If the data item is not numeric, the function returns the value 0, which is the logical value of false.