Transcranial Doppler (TCD), first described in 1982 [1], is a noninvasive ultrasound (US) study that involves the use of a low-frequency (â¤2 MHz) transducer probe to insonate the basal cerebral arteries through relatively thin bone windows.
Details. as.character and is.character are generic: you can write methods to handle specific classes of objects, see InternalMethods. Further, for as.character the default method calls as.vector, so dispatch is first on methods for as.character and then for methods for as.vector.
Tweet. Key Difference: A character is a set of qualities that make someone or something different from others. Behavior, on the other hand, refers the way of behaving, the actions or reactions you give to others. A character of a person identifies a particular personâs qualities. It refers to the kind of a person you are from the inside. It is the values, ethics and morals you show to others and creates an image for you in somebodyâs mind. There are thousands of human beings who have different characters which god created for a person.