ISALPHA Test for Alpha Characters in a String

Section: String Functions

Usage

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

where s is a string. Note that this function is not locale sensitive, and returns a logical 1 for letters in the classic ASCII sense (a through z, and A through Z).

Example

A simple example of isalpha: 
--> isalpha('numb3r5')

ans = 
 1 1 1 1 0 1 0