mustBeLessThan

Validate that value is less than another value or issue error

Description

example

mustBeLessThan(value,c) issues an error if any elements in value are not less than 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

collapse all

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

collapse all

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™.

Introduced in R2017a