mustBeLessThan

Validate that value is less than another value or issue error

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Syntax

mustBeLessThan(value,c)

Description

example

mustBeLessThan(value,c) issues an error if any elements in value are greater than or equal to the scalar c. This function does not return a value.

mustBeLessThan accepts user-defined objects if the class of the object implements these methods:

This function ignores empty values in the first input argument. Therefore, no error is thrown when the property or function argument value is empty.

Examples

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Use mustBeLessThan to validate that the values in the first input are less than the value of the second input.

mustBeLessThan([2 3 4],2)
Error using mustBeLessThan (line 19)
Value must be less than 2.

Restrict property values to be less than a specified value.

This class constrains the value of Prop1 to be less than 2.

classdef MyClass
   properties
      Prop1 {mustBeLessThan(Prop1,2)}
   end
end

Create an object and assign a value to its property.

obj = MyClass;
obj.Prop1 = 2;
Error setting property 'Prop1' of class 'MyClass':
Value must be less than 2.

When you assign a value to the property, MATLAB® calls mustBeLessThan with the value being assigned to the property. mustBeLessThan issues an error because the value 2 is not less than 2.

This function restricts the input argument to be values that are less than 5. 

function r = mbLessThan(x)
    arguments
        x {mustBeLessThan(x,5)}
    end
    r = x + 5;
end

Calling the function with a vector that contains values that are greater than or equal to 5 does not meet the requirements defined with mustBeLessThan and results in an error.

x = [1.27, 4.54, 3.9, 5.0, .531];
r = mbLessThan(x);
Error using mbLessThan
Invalid input argument at position 1. Value must be less than 5.

Input Arguments

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

When using mustBeLessThan as a property validator, this argument must be the property name, specified without quotation marks.

Constant value that the value argument must be less than, specified as a scalar of one of the following:

Extended Capabilities

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

See Also

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Topics

Introduced in R2017a

MATLAB Documentation
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