mustBeNonmissing

Validate that value is not missing

Since R2020b

Syntax

mustBeNonmissing(value)

Description

mustBeNonmissing(value) throws an error if value contains missing values. This function does not return a value.

mustBeNonmissing calls the ismissing function to determine if the input is not missing.

Class support: All numeric classes, string, and MATLAB^® classes that overload ismissing.

Examples

Test for Missing Array Elements

The labelPlot function uses the elements of a 1-by-3 string array to label the x- and y-axes of a plot and add a title. The function does not allow missing array elements.

function labelPlot(labels)
    arguments
        labels (1,3) string  {mustBeNonmissing}
    end
    xlabel(labels(1))
    ylabel(labels(2))
    title(labels(3))
end

Create a plot and use the labelPlot function to add labels and a title. The function input array contains a missing element so the mustBeNonmissing function throws an error.

plot(1:10)
strLabels = ["X Label",string(missing),"My Plot"];
labelPlot(strLabels)

Error using labelPlot
 labelPlot(strLabels)
           ↑
Invalid argument at position 1. Value must not have missing data.

Input Arguments

value — Value to validate

scalar | array

Value to validate, specified as a scalar or an array of any MATLAB type or user-defined object that supports the ismissing function.

Tips

• mustBeNonmissing is designed to be used for property and function argument validation.

• For information on what constitutes a missing value for different types of values, see the ismissing function.

Extended Capabilities

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

GPU Arrays

Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.

This function fully supports GPU arrays. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Distributed Arrays

Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).

Version History

Introduced in R2020b

R2022b: Character arrays have no standard missing value

Character arrays have no default definition of a standard missing value. Therefore, mustBeNonmissing now treats blank character array elements (' ') as nonmissing. For example, mustBeNonmissing(['a b']) determines that ['a b'] is not missing. Previously, it determined that ['a b'] contains missing values and threw an error.