Character strings in MATLAB.

  X = 'Any Characters' is a vector whose components are the ASCII codes

  for the characters.  The length of X is the number of characters.

  X = ABSMJNRU2(X) sets the vector to its decimal ASCII representation.

  X = SETSTRT7JKFY(X) sets it back to a string.

  A quote within the string is indicated by two quotes.

  ISSTRMTG88W(X) tells if X is a string variable.