Add LUDecomposition triangular factor tests (#253)

ilhamsj · Mar 4, 2018 · 33efab2 · 33efab2
1 parent 941d240
commit 33efab2
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/tests/Math/LinearAlgebra/LUDecompositionTest.php b/tests/Math/LinearAlgebra/LUDecompositionTest.php
@@ -28,4 +28,22 @@ public function testSolveWithInvalidMatrix(): void
         $lu = new LUDecomposition(new Matrix([[1, 2], [3, 4]]));
         $lu->solve(new Matrix([1, 2, 3]));
     }
+
+    public function testLowerTriangularFactor(): void
+    {
+        $lu = new LUDecomposition(new Matrix([[1, 2], [3, 4]]));
+        $L = $lu->getL();
+
+        $this->assertInstanceOf(Matrix::class, $L);
+        $this->assertSame([[1.0, 0.0], [0.3333333333333333, 1.0]], $L->toArray());
+    }
+
+    public function testUpperTriangularFactor(): void
+    {
+        $lu = new LUDecomposition(new Matrix([[1, 2], [3, 4]]));
+        $U = $lu->getU();
+
+        $this->assertInstanceOf(Matrix::class, $U);
+        $this->assertSame([[3.0, 4.0], [0.0, 0.6666666666666667]], $U->toArray());
+    }
 }