D1num D1num_sub IsFinite IsFinite_sub IsInf IsInf_sub IsNan IsNan_sub IsNormal IsNormal_sub Signbit Signbit_sub

IsInf() Function IsInf ( X As  Double ) Determine if infinite value Purpose IsInf determines if the given argument has infinite value with positive or negative sign. Returns Boolean If X has infinite value, True is returned. Otherwise, False is returned. Parameters [in] X Argument to be examined.