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4.14: Logical Functions for Arrays

Fundamentals of MATLAB Programming · LibreTexts

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    From LibreTexts, under CC BY-NC-SA, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    MATLAB also includes functions that test the type or properties of an array. These functions return logical values: true or false.

    Function

    Purpose

    ischar(A)

    Tests whether A is a character array

    islogical(A)

    Tests whether A is a logical array

    isnumeric(A)

    Tests whether A is numeric

    isinteger(A)

    Tests whether A is an integer array

    isfloat(A)

    Tests whether A is a floating-point array

    isreal(A)

    Tests whether A contains real values

    isa(A, className)

    Tests whether A belongs to a specific class

    isprime(A)

    Returns true for prime values in A

    isfinite(A)

    Returns true for finite values in A

    isinf(A)

    Returns true for infinite values in A

    isnan(A)

    Returns true for NaN values in A

    isequal(A,B)

    Tests whether arrays have the same contents

    These functions are useful for checking data before performing calculations. For example, you may want to confirm that an input is numeric before trying to calculate with it.

    This page titled 4.14: Logical Functions for Arrays was last modified on Tue, 30 Jun 2026 02:11:58 GMT and is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by Zara Noroozi.