diff --git a/lib/matrix.rb b/lib/matrix.rb
index 66107ff..379dee1 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1707,38 +1707,22 @@ class Vector
   end
 
   #
-  # Vector addition.
+  # Vector addition and subtraction.
   #
-  def +(v)
-    case v
-    when Vector
-      Vector.Raise ErrDimensionMismatch if size != v.size
-      els = collect2(v) {|v1, v2|
-        v1 + v2
-      }
-      self.class.elements(els, false)
-    when Matrix
-      Matrix.column_vector(self) + v
-    else
-      apply_through_coercion(v, __method__)
-    end
-  end
-
-  #
-  # Vector subtraction.
-  #
-  def -(v)
-    case v
-    when Vector
-      Vector.Raise ErrDimensionMismatch if size != v.size
-      els = collect2(v) {|v1, v2|
-        v1 - v2
-      }
-      self.class.elements(els, false)
-    when Matrix
-      Matrix.column_vector(self) - v
-    else
-      apply_through_coercion(v, __method__)
+  %i(+ -).each do |op|
+    define_method(op) do |v|
+      case v
+      when Vector
+        Vector.Raise ErrDimensionMismatch unless size == v.size
+        els = collect2(v) {|v1, v2|
+          v1.send(op, v2)
+        }
+        self.class.elements(els, false)
+      when Matrix
+        Matrix.column_vector(self).send(op, v)
+      else
+        apply_through_coercion(v, op)
+      end
     end
   end