Add failing case to EigenvectorTest

The added matrix is the U matrix calculated in the SVD decomposition of the failing case in both the SVDTest + pseudoinverse test

Author: Aweptimum

tests/LinearAlgebra/Eigen/EigenvectorTest.php

@@ -47,6 +47,7 @@ public function testEigenvectorsUsingClosedFormPolynomialRootMethodFromMatrix(ar
 
     public function dataProviderForEigenvector(): array
     {
+        $b = 0.00061146305;
         return [
             [
                 [
@@ -128,6 +129,24 @@ public function dataProviderForEigenvector(): array
                     [6 / \sqrt(65), -2 / 3, 1 / \sqrt(5),],
                 ]
             ],
+            [ // Failing case
+                [
+                    [2,0,0,0,0,0],
+                    [0,2,0,0,0,1729.7],
+                    [0,0,2,0,-1729.7,0],
+                    [0,0,0,0,0,0],
+                    [0,0,-1729.7,0,2.82879*10**6,0],
+                    [0,1729.7,0,0,0,2.82879*10**6]
+                ],
+                [
+                    [0, 0, 1, 0, 0, 0],
+                    [0.00061146305, 0, 0,-1635.422, 0, 0],
+                    [0,-0.00061146305, 0, 0,1635.422, 0],
+                    [0, 0, 0, 0, 0, 1],
+                    [0, 1, 0, 0, 1, 0],
+                    [1, 0, 0, 1, 0, 0],
+                ]
+            ],
         ];
     }