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.
There are two ways to access an individual character in a string. The first is the charAt() method: return 'cat'.charAt(1); // returns a. The other way (introduced in ECMAScript 5) is to treat the string as an array-like object, where individual characters correspond to a numerical index: