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matlab.unittest.constraints.IsSparse Class

Namespace: matlab.unittest.constraints
Superclasses: matlab.unittest.constraints.BooleanConstraint

Test if array is sparse

Description

The matlab.unittest.constraints.IsSparse class provides a constraint to test if an array is sparse.

Creation

Description

example

c = matlab.unittest.constraints.IsSparse creates a constraint to test if an array is sparse. The constraint is satisfied if the storage class of the array is sparse.

Examples

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Test numeric arrays using the IsSparse constraint.

First, import the classes used in this example.

import matlab.unittest.TestCase
import matlab.unittest.constraints.IsSparse

Create a test case for interactive testing.

testCase = TestCase.forInteractiveUse;

Test if an identity matrix is sparse. The test fails.

I = eye(7);
testCase.verifyThat(I,IsSparse)
Verification failed.
    ---------------------
    Framework Diagnostic:
    ---------------------
    IsSparse failed.
    --> The value must be sparse.
    
    Actual Value:
         1     0     0     0     0     0     0
         0     1     0     0     0     0     0
         0     0     1     0     0     0     0
         0     0     0     1     0     0     0
         0     0     0     0     1     0     0
         0     0     0     0     0     1     0
         0     0     0     0     0     0     1

Convert I to a sparse matrix and test again. The test passes.

S = sparse(I);
testCase.verifyThat(S,IsSparse)
Verification passed.

Version History

Introduced in R2013a