diff --git a/src/main/java/ch/hepia/numeric/Vector.java b/src/main/java/ch/hepia/numeric/Vector.java
index b853d07e4919fd701c8f5dd7144a4dc93b709094..c03fca952d724535b10059aa47d651192a524d83 100644
--- a/src/main/java/ch/hepia/numeric/Vector.java
+++ b/src/main/java/ch/hepia/numeric/Vector.java
@@ -7,11 +7,12 @@ import java.util.function.Function;
 
 final public class Vector {
 
-    private static List<Double> lstVector;// = new ArrayList<Double>();
+    private List<Double> lstVector;// = new ArrayList<Double>();
 
     private Vector() {
       this.lstVector=new ArrayList<Double>();
     }
+
     private Vector(Double... elements) {
       this.lstVector=new ArrayList<Double>();
        for(double e:elements)
@@ -36,6 +37,8 @@ final public class Vector {
     public int len() {
         throw new UnsupportedOperationException("This feature isn't implemented yet");
     }
+        //assertEquals(v1.toString(), "Vector[1.0, 2.0, 3.0]");
+        //assertEquals(v1.add(v2),v3);
 
     public double get(int i) {
         throw new UnsupportedOperationException("This feature isn't implemented yet");
@@ -46,11 +49,12 @@ final public class Vector {
 
     public Vector add(Vector that) {
         //throw new UnsupportedOperationException("This feature isn't implemented yet");
-        for(double e:that.lstVector)
+        Vector v = new Vector();
+        for(int i=0;i<this.lstVector.size();i++)//a ameliorer avec for(e:element)
         {
-          this.lstVector.add(e);
+          v.lstVector.add(Double.sum(this.lstVector.get(i),that.lstVector.get(i)));
         }
-        return this;
+        return v;
     }
 
     public Vector mul(double m) {
@@ -151,7 +155,14 @@ final public class Vector {
           // Apply formatting to the string if necessary
           strings.add(d.toString());
       }
-      return "Vector"+String.valueOf(strings);
+      if(this instanceof Vector)
+      {
+        return "Vector"+String.valueOf(strings);
+      }
+      else
+      {
+        return "Transposed"+String.valueOf(strings);
+      }
         //throw new UnsupportedOperationException("This feature isn't implemented yet");
     }
 
diff --git a/src/test/java/ch/hepia/numeric/AppTest.java b/src/test/java/ch/hepia/numeric/AppTest.java
index d72c29bb0309884b59f5b70c173239031fdf6c75..41b50e872c0459ce67747de68c8546797290716b 100644
--- a/src/test/java/ch/hepia/numeric/AppTest.java
+++ b/src/test/java/ch/hepia/numeric/AppTest.java
@@ -14,8 +14,11 @@ class VectorTest {
     void vectorMainOperations() {
         Vector v1 = Vector.of(1.0, 2.0, 3.0);
         Vector v2 = Vector.of(-1.0, -2.0, -3.0);
-        //System.out.println(v2.toString());
-        //v2 = v1.add(v2);
+        Vector v3 = Vector.of(-1.0, -2.0, -3.0);
+        v3=v1.add(v2);
+        System.out.println(v1.toString());
+        System.out.println(v2.toString());
+        System.out.println(v3.toString());
         //assertEquals(v1.add(v2), Vector.of(0.0, 0.0, 0.0));
         //assertEquals(v1.sub(v2), Vector.of(2.0, 4.0, 6.0));
         //assertEquals(v1.mul(3.0), Vector.of(3.0, 6.0, 9.0));