ISDIGIT  ISDIGIT Test for Digit Characters in a String


Usage
 
 The isdigit functions returns a logical array that is 1 
 for characters in the argument string that are digits, and 
 is a logical 0 for characters in the argument that are not
 digits.  The syntax for its use is
 
    x = isdigit(s)
 
 where s is a string.  
 