Determine which character array elements are letters

Syntax

TF = isletter(A)

Description

TF = isletter(A)returns a logical arrayTF. IfAis a character array, the elements ofTFare logical1(true) where the corresponding elements ofAare letters, and logical0(false) elsewhere.

IfAis not a character array, thenisletterreturns logical0(false).

Examples

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Open Live Script

Create different arrays, and then determine which array elements are letters.

chr ='123 Main St.'

chr = '123 Main St.'

TF = isletter(chr)

TF =1×12 logical array0 0 0 0 1 1 1 1 0 1 1 0

Starting in R2016b, you can convert character arrays to strings using thestringfunction. Convertchrto a string, and test it. The input argument is not a character array, soisletterreturns0.

str = string(chr)

str = "123 Main St."

TF = isletter(str)

TF =logical0

Input Arguments

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`A`— Input array
scalar | vector | matrix | multidimensional array

Input array, specified as a scalar, vector, matrix, or multidimensional array.Acan be any data type.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

Input values from thecharclass must be in the range 0-127.

Documentation

isletter

Syntax

Description

Examples