Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

mustBeReal

Validate that value is real or issue error

Syntax

mustBeReal(A)

Description

example

mustBeReal(A) issues an error if A is not a real number. This function does not return a value.

mustBeReal accepts user-defined objects if the class of the object implements this method:

Examples

collapse all

Use mustBeReal to validate that the input is a real number.

Validate that a calculation results in real numbers.

x = -2:2;
z = x.^exp(-x.^2);
mustBeReal(z)
Error using mustBeReal (line 13)
values must be real.

The value z is complex.

This class constrains the value of Prop1 to real values.

classdef MyClass
   properties
      Prop1 {mustBeReal}
   end
end

Create an object and assign a value to its property.

x = -2:0.1:2;
obj = MyClass;
obj.Prop1 = x.^exp(-x.^2);
Error setting 'Prop1' property of 'MyClass' class:
values must be real.

When you assign a value to the property, MATLAB® calls mustBeReal with the value being assigned to the property. mustBeReal issues an error because the value assigned to Prop1 is complex.

Input Arguments

collapse all

Value to validate, specified as a scalar or array of any one of the following:

Other data types cause an error.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char
Complex Number Support: Yes

Extended Capabilities

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

Introduced in R2017a

Was this topic helpful?