Added not equal universal function

Author: andrewdalpino

src/ColumnVector.php

@@ -276,6 +276,38 @@ protected function equalMatrix(Matrix $b) : Matrix
         return Matrix::quick($c);
     }
 
+        /**
+     * Return the element-wise not equal comparison of this column vector
+     * and a matrix.
+     *
+     * @param  \Rubix\Tensor\Matrix  $b
+     * @throws \Rubix\Tensor\Exceptions\DimensionalityMismatchException
+     * @return \Rubix\Tensor\Matrix
+     */
+    protected function notEqualMatrix(Matrix $b) : Matrix
+    {
+        if ($this->n !== $b->m()) {
+            throw new DimensionalityMismatchException("Vector A requires"
+                . " $this->n rows but Matrix B has {$b->m()}.");
+        }
+
+        $c = [];
+
+        foreach ($b as $i => $row) {
+            $valueA = $this->a[$i];
+
+            $temp = [];
+
+            foreach ($row as $valueB) {
+                $temp[] = $valueA != $valueB ? 1 : 0;
+            }
+
+            $c[] = $temp;
+        }
+
+        return Matrix::quick($c);
+    }
+
     /**
      * Return the element-wise greater than comparison of this column
      * vector and a matrix.