## ISDIGIT Test for Digit Characters in a String

Section: String Functions

### 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`.

### Example

A simple example of `isdigit`:

    --> isdigit('numb3r5')

    ans =

     0 0 0 0 1 0 1