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FreeMat
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Section: String Functions
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).
A simple example of isalpha:
--> isalpha('numb3r5')
ans =
1 1 1 1 0 1 0