Add addVector() and subtractVector() for convenience.

Author: mcordingley

src/Vector.php

@@ -40,6 +40,24 @@ public function getSize(): int
         return $this->getColumnCount();
     }
 
+    /**
+     * @param Vector $other
+     * @return Vector
+     */
+    public function addVector(self $other): self
+    {
+        return self::fromMatrix($this->addMatrix($other));
+    }
+
+    /**
+     * @param Vector $other
+     * @return Vector
+     */
+    public function subtractVector(self $other): self
+    {
+        return self::fromMatrix($this->subtractMatrix($other));
+    }
+
     /**
      * @return float
      */

tests/VectorTest.php

@@ -50,6 +50,32 @@ public function testGetSize()
         $this->assertEquals(4, $vector->getSize());
     }
 
+    public function testAddVector()
+    {
+        $vector1 = new Vector([1, 2, 3, 4]);
+        $vector2 = new Vector([-1, 3, 5, 2]);
+
+        $added = $vector1->addVector($vector2);
+
+        static::assertEquals(0, $added->get(0, 0));
+        static::assertEquals(5, $added->get(0, 1));
+        static::assertEquals(8, $added->get(0, 2));
+        static::assertEquals(6, $added->get(0, 3));
+    }
+
+    public function testSubtractVector()
+    {
+        $vector1 = new Vector([1, 2, 3, 4]);
+        $vector2 = new Vector([-1, 3, 5, 2]);
+
+        $added = $vector1->subtractVector($vector2);
+
+        static::assertEquals(2, $added->get(0, 0));
+        static::assertEquals(-1, $added->get(0, 1));
+        static::assertEquals(-2, $added->get(0, 2));
+        static::assertEquals(2, $added->get(0, 3));
+    }
+
     public function testSum()
     {
         $vector = self::buildVector();