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isnan

Determine which array elements are NaN

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Syntax

TF = isnan(A)

Description

example

TF= isnan(A)returns a logical array containing1(true) where the elements ofAareNaN, and0(false) where they are not. IfAcontains complex numbers,isnan(A)contains1for elements with either real or imaginary part isNaN, and0元素,真实的和imaginary parts are notNaN.

Examples

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Open Live Script

Create a row vector and determine which elements areNaN.

A = 0./[-2 -1 0 1 2]
A =1×50 0 NaN 0 0
TF = isnan(A)
TF =1x5 logical array0 0 1 0 0
Open Live Script

Create an array of complex numbers. Determine whether the complex numbers containNaN.

A = [2 + 1i, 1/0 + 3i, 1/2 - 1i*NaN]
A =1×3 complex2.0000 + 1.0000i Inf + 3.0000i NaN + NaNi
TF = isnan(A)
TF =1 x3逻辑阵列0 0 1
Open Live Script

Create an array and find the elements withNaNvalues.

A = [1,3,5,7,NaN,10,NaN,4,6,8]
A =1×1013 5 7 NaN 10 NaN 4 6 8
TF = isnan(A)
TF =1x10 logical array0 0 0 0 1 0 1 0 0 0

Index intoAwithTFto access the elements ofAthat areNaN. Replace theNaNvalues with 0.

A(TF) = 0
A =1×1013 5 7 0 10 0 4 6 8

Input Arguments

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Input array, specified as a scalar, vector, matrix, or multidimensional array.

Tips

  • Ifxis a real scalar, exactly one ofisfinite(x),isinf(x), andisnan(x)returns logical1(true).

  • For a complex scalarz,isinf(z)和isnan(z)can both return logical 1. For example,isinf(complex(Inf,NaN))和isnan(complex(Inf,NaN))both return logical 1.

Extended Capabilities

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

HDL Code Generation
Generate Verilog and VHDL code for FPGA and ASIC designs using HDL Coder™.

See Also

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Topics

Introduced before R2006a

MATLAB Documentation

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Introducing Deep Learning with MATLAB

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