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