ABS	Absolute value and string to numeric conversion.
 	ABS(X) is the absolute value of the elements of X. When
  	X is complex, ABS(X) is the complex modulus (magnitude) of
  	the elements of X.
 
 	See also ANGLE, UNWRAP.
 
 	ABS(S), where S is a MATLAB string variable, returns the
 	numeric values of the ASCII characters in the string.
 	It does not change the internal representation, only the 
 	way it prints.
 	See also SETSTR.