# matlab.unittest.constraints.HasInf class

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

Test if array has infinite values

## Description

The `matlab.unittest.constraints.HasInf` class provides a constraint to test if an array has infinite values.

## Creation

### Description

example

````c = matlab.unittest.constraints.HasInf` creates a constraint to test if an array has infinite values. The constraint is satisfied by a numeric array that has at least one infinite value.```

## Examples

collapse all

Test numeric arrays using the `HasInf` constraint.

First, import the classes used in this example.

```import matlab.unittest.TestCase import matlab.unittest.constraints.HasInf```

Create a test case for interactive testing.

`testCase = TestCase.forInteractiveUse;`

Verify that `Inf` satisfies the `HasInf` constraint.

`testCase.verifyThat(Inf,HasInf)`
`Verification passed.`

Test if the vector `[1 1 2 3 5 8 13]` has infinite values. The test fails because all vector elements are finite.

`testCase.verifyThat([1 1 2 3 5 8 13],HasInf)`
```Verification failed. --------------------- Framework Diagnostic: --------------------- HasInf failed. --> At least one element must be Inf or -Inf. Actual Value: 1 1 2 3 5 8 13```

Test `[-Inf 5 NaN]`. The test passes because the vector contains an infinite value.

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

Test if a complex number with an infinite imaginary part satisfies the constraint. The test passes.

`testCase.verifyThat(3+1i/0,HasInf)`
`Verification passed.`

Test if the matrix `[1 NaN; -Inf 3]` does not have any infinite values. The test fails.

`testCase.verifyThat([1 NaN; -Inf 3],~HasInf)`
```Verification failed. --------------------- Framework Diagnostic: --------------------- Negated HasInf failed. --> All elements must be finite or NaN. Failing indices: 2 Actual Value: 1 NaN -Inf 3```

## Version History

Introduced in R2013a