# is_letter

Version:

Determines whether characters in a string are letters of the alphabet.

## Syntax

c = is_letter(a)
Legacy name: isletter

String.

## c

Matrix of Boolean values. An element in c is 1 if and only if the corresponding character of a is a lowercase or uppercase letter of the alphabet. Otherwise, the element is 0. c is a matrix of the same size as the number of characters in a.

C = is_letter('abd?PW5^&888')
C = is_letter('TEST')

Where This Node Can Run:

Desktop OS: Windows

FPGA: This product does not support FPGA devices