NAME
    isnum - whether a value is a numeric value

SYNOPSIS
    isnum(x)

TYPES
    x		any, &any

    return	int

DESCRIPTION
    Determine if x is a numeric value.  This function will return 1 if x
    is a a numeric value, 0 otherwise.

EXAMPLE
    > print isnum(2.0), isnum(1), isnum("0")
    1 1 0

    > print isnum(2i), isnum(1e20), isnum(1/3)
    1 1 1

LIMITS
    none

LIBRARY
    none

SEE ALSO
    isassoc, isfile, isint, islist, ismat, isnull, isnum, isobj, isreal,
    isstr, issimple, istype
