diff --git a/viz/ts/svg/thinkChart/Math/Vector.ts b/viz/ts/svg/thinkChart/Math/Vector.ts
index 8beca98..13f6164 100644
--- a/viz/ts/svg/thinkChart/Math/Vector.ts
+++ b/viz/ts/svg/thinkChart/Math/Vector.ts
@@ -1,6 +1,38 @@
-namespace Math2D {
+/// <reference path="../../../build/linq.d.ts"/>
 
-    export class Vector {
+namespace Math2D {
 
+    export class Vector extends IEnumerator<number> {
+
+        public constructor(x: number[] | IEnumerator<number>) {
+            super(x);
+        }
+
+        public Add(x: number | IEnumerator<number> | Vector): Vector {
+            var type = TypeInfo.typeof(x);
+            var out: number[] = [];
+
+            if (type.typeOf == "number") {
+                x = <number>x;
+
+                for (var i: number = 0; i < this.Count; i++) {
+                    out.push(x + this.sequence[i]);
+                }
+            } else if (type.IsEnumerator || type.class == "Vector") {
+                x = <IEnumerator<number>>x;
+
+                if (x.Count != this.Count) {
+                    throw `Two sequence length not agree!`;
+                }
+
+                for (var i: number = 0; i < this.Count; i++) {
+                    out.push(x.ElementAt(i) + this.sequence[i]);
+                }
+            } else {
+                throw `Unsupported type: ${type.class}!`;
+            }
+
+            return new Vector(out);
+        }
     }
 }
\ No newline at end of file