STRING:

	Strings are the equivalent of C string constants (or string
	literals). Strings are entered from the command line like:

	> str = "Sample String"
	Sample String

	The show command reveals the attributes associated with each
	string. 

	> show ( str )
	   name:      str     
	   class:     string  
	    type:             
	     nr:      1       
	     nc:      1       

	The information can also be obtained, by referencing the
	object members.

	> str.class
	string
	> str.l
	          13

	Strings are always enclosed in `"'. Single quotes, either
	forward or backward have no special meaning in RLaB.

	Strings can contain escape characters;

	`\n'	newline
	`\t'	tab
	`\f'	formfeed	
	`\b'	backspace
	`\r'	carriage return
	`\a'	alert (bell)
	`\v'	vertical tab
	`\\'	backslash
	`\''	single quote
	`\"'	double quote

	Strings can be concatenated using the addition operator (`+').
	Since you cannot break a string across lines you can:

	"Entering a really long string, with more to go. " + ...
	"Now type in the rest of it... "

	The above will produce a single string.

	Strings can be used to form matrices, in the same way the
	numeric values can form a numeric matrix:

	> strm = [ "str11", "str12";
	>          "str21", "str22"]
	 strm =
	str11  str12  
	str21  str22  

	The elements of a string matrix do not need to be the same
	length. The output from what() is a good example.
	
	Scalar strings cannot be mixed with numeric scalars in the
	same matrix. Lists provide a good method of mixing string and
	numeric data.

	The built-in function strsplt() is provided to split a string
	scalar into individual characters. 
