isletter - Determine which characters are letters - MATLAB (original) (raw)

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Determine which characters are letters

Syntax

Description

TF = isletter([A](#bvidfjl-A)) returns a logical arrayTF. If A is a character array or string scalar, then the elements of TF are logical 1 (true) where the corresponding characters inA are letters, and logical 0 (false) elsewhere.

If A is not a character array or string scalar, thenisletter returns logical 0 (false).

example

Examples

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

TF = 1×12 logical array

0 0 0 0 1 1 1 1 0 1 1 0

Convert chr to a string, and test it. The input argument is not a character array, so isletter returns 0.

TF = 1×12 logical array

0 0 0 0 1 1 1 1 0 1 1 0

Input Arguments

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

Tips

To find letters within elements of a nonscalar string array, use the isstrprop function.

Extended Capabilities

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Usage notes and limitations:

• Input values from the char class must be in the range 0-127.

Version History

Introduced before R2006a