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matlab.unittest.constraints.IsReal class

Package: matlab.unittest.constraints
Superclasses: matlab.unittest.constraints.BooleanConstraint

Test if array elements are real values

Description

The matlab.unittest.constraints.IsReal class provides a constraint to test if elements of an array are real values.

Creation

Description

example

c = matlab.unittest.constraints.IsReal creates a constraint to test if all elements of an array are real values. The constraint is satisfied by a numeric array that does not use complex storage.

Examples

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Test numeric arrays using the IsReal constraint.

First, import the classes used in this example.

import matlab.unittest.TestCase
import matlab.unittest.constraints.IsReal

Create a test case for interactive testing.

testCase = TestCase.forInteractiveUse;

Verify that the value 5 is real.

testCase.verifyThat(5,IsReal)
Verification passed.

Now test the value complex(5). Even though the value of the imaginary part is zero, the test fails because the value is stored as a complex number.

testCase.verifyThat(complex(5),IsReal)
Verification failed.
    ---------------------
    Framework Diagnostic:
    ---------------------
    IsReal failed.
    --> The value must be real.
    
    Actual Value:
      5.000000000000000 + 0.000000000000000i

Test the value sqrt(-1). The test fails.

testCase.verifyThat(sqrt(-1),IsReal)
Verification failed.
    ---------------------
    Framework Diagnostic:
    ---------------------
    IsReal failed.
    --> The value must be real.
    
    Actual Value:
      0.000000000000000 + 1.000000000000000i

Test if the vector [1 1 2 3 5 8 13] satisfies the IsReal constraint. The test passes because all vector elements are real.

testCase.verifyThat([1 1 2 3 5 8 13],IsReal)
Verification passed.

Test a vector that contains infinite and NaN values. The test passes.

testCase.verifyThat([-Inf 5 NaN],IsReal)
Verification passed.

Verify that the matrix [1 NaN; -Inf 3i] is not real.

testCase.verifyThat([1 NaN; -Inf 3i],~IsReal)
Verification passed.

Version History

Introduced in R2013a