diff --git a/Esiur.Analysis.Test/FGraph.Designer.cs b/Esiur.Analysis.Test/FGraph.Designer.cs
index a0184dc..4092b59 100644
--- a/Esiur.Analysis.Test/FGraph.Designer.cs
+++ b/Esiur.Analysis.Test/FGraph.Designer.cs
@@ -28,19 +28,49 @@
         /// </summary>
         private void InitializeComponent()
         {
+            this.button1 = new System.Windows.Forms.Button();
+            this.pbDraw = new System.Windows.Forms.PictureBox();
+            ((System.ComponentModel.ISupportInitialize)(this.pbDraw)).BeginInit();
             this.SuspendLayout();
             // 
+            // button1
+            // 
+            this.button1.Location = new System.Drawing.Point(468, 409);
+            this.button1.Name = "button1";
+            this.button1.Size = new System.Drawing.Size(75, 23);
+            this.button1.TabIndex = 0;
+            this.button1.Text = "Step";
+            this.button1.UseVisualStyleBackColor = true;
+            this.button1.Click += new System.EventHandler(this.button1_Click);
+            // 
+            // pbDraw
+            // 
+            this.pbDraw.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
+            this.pbDraw.Location = new System.Drawing.Point(36, 40);
+            this.pbDraw.Name = "pbDraw";
+            this.pbDraw.Size = new System.Drawing.Size(639, 345);
+            this.pbDraw.TabIndex = 1;
+            this.pbDraw.TabStop = false;
+            this.pbDraw.Paint += new System.Windows.Forms.PaintEventHandler(this.pbDraw_Paint);
+            // 
             // FGraph
             // 
-            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 20F);
+            this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 15F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
-            this.ClientSize = new System.Drawing.Size(838, 494);
+            this.ClientSize = new System.Drawing.Size(729, 459);
+            this.Controls.Add(this.pbDraw);
+            this.Controls.Add(this.button1);
+            this.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);
             this.Name = "FGraph";
             this.Text = "FGraph";
+            ((System.ComponentModel.ISupportInitialize)(this.pbDraw)).EndInit();
             this.ResumeLayout(false);
 
         }
 
         #endregion
+
+        private Button button1;
+        private PictureBox pbDraw;
     }
 }
\ No newline at end of file
diff --git a/Esiur.Analysis.Test/FGraph.cs b/Esiur.Analysis.Test/FGraph.cs
index fd3b6e6..dce861f 100644
--- a/Esiur.Analysis.Test/FGraph.cs
+++ b/Esiur.Analysis.Test/FGraph.cs
@@ -1,4 +1,5 @@
-using System;
+using Esiur.Analysis.Graph;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
@@ -12,9 +13,94 @@ namespace Esiur.Analysis.Test
 {
     public partial class FGraph : Form
     {
+        DirectedGraph<decimal> graph;
+        int step = 0;
+
         public FGraph()
         {
+            graph = new DirectedGraph<decimal>();
+
+            var n1 = graph.AddNode(1, "1", 80, 120);
+            var n2 = graph.AddNode(2, "2", 300, 120);
+
+            graph.Link(n1, n2, (decimal)0.5, "1->2");
+            graph.Link(n1, n1, (decimal)0.5, "1->1");
+
+            graph.Link(n2, n1, (decimal)0.2, "2->1");
+            graph.Link(n2, n2, (decimal)0.8, "2->2");
+
+            graph.Build();
+
             InitializeComponent();
         }
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+            graph.Step();
+            step++;
+            pbDraw.Refresh();
+
+         }
+
+        private void pbDraw_Paint(object sender, PaintEventArgs e)
+        {
+            
+            var pen = new Pen(Brushes.Red, 4);
+            var g = e.Graphics;
+
+            g.FillRectangle(Brushes.White, 0, 0, pbDraw.Width, pbDraw.Height);
+
+            // update label
+            foreach (var edge in graph.Edges)
+            {
+                DrawArcBetweenTwoPoints(g, pen, new PointF(edge.SourceNode.X, edge.SourceNode.Y),
+                    new PointF(edge.DestinationNode.X, edge.DestinationNode.Y), edge.Label + " " + Math.Round( edge.Weight, 4));
+            }
+
+            foreach (var node in graph.Nodes)
+            {
+                g.FillEllipse(Brushes.LightGreen, node.X - 30, node.Y - 30, 60, 60);
+                g.DrawString(node.Label, new Font("Arial", 26), Brushes.Blue, node.X - 15, node.Y - 20);
+            }
+
+
+            g.DrawString("Step " + step, new Font("Arial", 26), Brushes.Orange, new PointF(20, pbDraw.Height - 50));
+
+            g.Flush();
+        }
+
+
+        public void DrawArcBetweenTwoPoints(Graphics g, Pen pen, PointF a, PointF b, string label)
+        {
+            
+            if (a.X == b.X && a.Y == b.Y)
+            {
+                var c = new PointF(a.X, a.Y - 60);
+
+                // draw 
+                g.DrawString(label, new Font("Arial", 14), Brushes.Black, new PointF(c.X, c.Y - 25));
+
+                g.DrawCurve(pen, new PointF[] { a, new PointF(a.X - 30, a.Y - 30), c, new PointF(a.X + 30, a.Y - 30), a });
+            }
+            else  
+            {
+                if (b.X > a.X)
+                {
+                    var c = new PointF(a.X + ((b.X - a.X) / 2), a.Y - 20);
+                    g.DrawCurve(pen, new PointF[] { a, c, b });
+                    g.DrawString(label, new Font("Arial", 14), Brushes.Black, new PointF( c.X - 30, c.Y - 25));
+
+                }
+                else
+                {
+                    var c = new PointF(b.X + ((a.X - b.X) / 2), b.Y + 20);
+                    g.DrawCurve(pen, new PointF[] { b, c, a });
+                    g.DrawString(label, new Font("Arial", 14), Brushes.Black, new PointF(c.X - 30, c.Y + 5));
+                }
+
+              
+            }
+        }
+
     }
 }
diff --git a/Esiur.Analysis.Test/Program.cs b/Esiur.Analysis.Test/Program.cs
index db93172..d7f139d 100644
--- a/Esiur.Analysis.Test/Program.cs
+++ b/Esiur.Analysis.Test/Program.cs
@@ -3,6 +3,7 @@ using System.Net.Sockets;
 using System.Text;
 using Esiur.Analysis.Coding;
 using Esiur.Analysis.DSP;
+using Esiur.Analysis.Graph;
 using Esiur.Analysis.Signals;
 /*
  
@@ -31,6 +32,7 @@ SOFTWARE.
 using Esiur.Analysis.Signals.Codes;
 using Esiur.Data;
 using Esiur.Resource;
+using ScottPlot.Statistics.Interpolation;
 
 namespace Esiur.Analysis.Test
 {
@@ -45,6 +47,28 @@ namespace Esiur.Analysis.Test
         static void Main()
         {
 
+
+            var graph = new DirectedGraph<double>();
+
+            var n1 = graph.AddNode(1, "1", 10, 10);
+            var n2 = graph.AddNode(2, "2", 20, 10);
+
+            graph.Link(n1, n2, 0.5, "1->2");
+            graph.Link(n1, n1, 0.5, "1->1");
+
+            graph.Link(n2, n1, 0.2, "2->1");
+            graph.Link(n2, n2, 0.8, "2->2");
+            
+
+            var matrix = new Matrix<double>(new double[,] { { 0.5, 0.5 }, { 0.2, 0.8 } });
+
+            var m = matrix;
+            for(var i = 0; i < 3; i++)
+            {
+                m = m * m;
+                Console.WriteLine(m);
+            }
+
             var msg = Encoding.ASCII.GetBytes("A_DEAD_DAD_CEDED_A_BAD_BABE_A_BEADED_ABACA_BED").Select(x => CodeWord<Base2>.FromByte(x)).ToArray();// <Base2>());
 
             // convert msg to codewords
@@ -78,7 +102,7 @@ namespace Esiur.Analysis.Test
             // To customize application configuration such as set high DPI settings or default font,
             // see https://aka.ms/applicationconfiguration.
             ApplicationConfiguration.Initialize();
-            Application.Run(new FSoft());
+            Application.Run(new FGraph());
         }
     }
 }
\ No newline at end of file
diff --git a/Esiur.Analysis/Esiur.Analysis.csproj b/Esiur.Analysis/Esiur.Analysis.csproj
index f5b19ec..c1f6baa 100644
--- a/Esiur.Analysis/Esiur.Analysis.csproj
+++ b/Esiur.Analysis/Esiur.Analysis.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>netstandard2.1</TargetFramework>
@@ -20,6 +20,10 @@
     <None Include="Fuzzy\FuzzyRule.cs" />
   </ItemGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\Esiur\Esiur.csproj" />
   </ItemGroup>
diff --git a/Esiur.Analysis/Graph/DirectedGraph.cs b/Esiur.Analysis/Graph/DirectedGraph.cs
index f793edd..ad0a0e2 100644
--- a/Esiur.Analysis/Graph/DirectedGraph.cs
+++ b/Esiur.Analysis/Graph/DirectedGraph.cs
@@ -1,15 +1,75 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Text;
 
 namespace Esiur.Analysis.Graph
 {
-    public class DirectedGraph <T>: IGraph
+    public class DirectedGraph <T>: IGraph where T:struct
     {
-        public Node<T>[] Nodes { get; set; }
-        public Edge<T>[] Edges { get; set; }
+        public List<Node<T>> Nodes { get;} = new List<Node<T>>();
 
+        public List<Edge<T>> Edges { get; }= new List<Edge<T>>();
 
+        public void Link(Node<T> source, Node<T> destination , T weight, string label)
+        {
+            var edge = new Edge<T>() { SourceNode = source, DestinationNode = destination, Weight = weight, Label = label };
+            Edges.Add(edge);
+            source.Destinations.Add(edge);
+            destination.Sources.Add(edge);
+            
+        }
 
+        public Node<T> AddNode(T value, string label, int x, int y)
+        {
+            var n = new Node<T>() { Value = value, Label = label, X = x, Y = y };
+            Nodes.Add(n);
+            return n;
+        }
+
+        public Matrix<T> TransitionMatrix { get; private set; }
+
+        public Matrix<T> CurrentStep { get; private set; }
+
+        public Edge<T>[,] EdgesMatrix { get; private set; }
+
+        public void Build()
+        {
+            // create matrix
+            var m = new T[Nodes.Count, Nodes.Count];
+            var e = new Edge<T>[Nodes.Count, Nodes.Count];
+
+            for(var i = 0; i < Nodes.Count; i++)
+            {
+                for(var j = 0; j < Nodes.Count; j++)
+                {
+                    var link = Edges.FirstOrDefault(x => x.SourceNode == Nodes[i] && x.DestinationNode == Nodes[j]);
+                    if (link == null)
+                        m[i, j] = default(T);
+                    else
+                    {
+                        m[i, j] = link.Weight;
+                        e[i, j] = link;
+                    }
+                }
+            }
+
+            TransitionMatrix = new Matrix<T>(m);
+            CurrentStep = TransitionMatrix;
+            EdgesMatrix = e;
+        }
+
+        public void Step()
+        {
+            CurrentStep *= CurrentStep;
+            // update weights
+            for(var i = 0; i < CurrentStep.Rows; i++)
+                for(var j = 0; j < CurrentStep.Columns; j++)
+                {
+                    if (EdgesMatrix[i, j] != null)
+                        EdgesMatrix[i, j].Weight = CurrentStep[i, j];
+                }
+
+        }
     }
 }
diff --git a/Esiur.Analysis/Graph/Edge.cs b/Esiur.Analysis/Graph/Edge.cs
index eefbb7c..a0fc054 100644
--- a/Esiur.Analysis/Graph/Edge.cs
+++ b/Esiur.Analysis/Graph/Edge.cs
@@ -6,7 +6,11 @@ namespace Esiur.Analysis.Graph
 {
     public class Edge<T>
     {
-        public T SourceNode { get; set; }
-        public T DestinationNode { get; set; }
+        public Node<T> SourceNode { get; set; }
+        public Node<T> DestinationNode { get; set; }
+
+        public T Weight { get; set; }
+
+        public string Label { get; set; }
     }
 }
diff --git a/Esiur.Analysis/Graph/TransitionMatrix.cs b/Esiur.Analysis/Graph/Matrix.cs
similarity index 53%
rename from Esiur.Analysis/Graph/TransitionMatrix.cs
rename to Esiur.Analysis/Graph/Matrix.cs
index 12bbb82..72f1fc7 100644
--- a/Esiur.Analysis/Graph/TransitionMatrix.cs
+++ b/Esiur.Analysis/Graph/Matrix.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
-using System.Reflection.Metadata.Ecma335;
-using System.Security.Cryptography.X509Certificates;
+using System.Data.Common;
 using System.Text;
 
 namespace Esiur.Analysis.Graph
@@ -20,7 +19,34 @@ namespace Esiur.Analysis.Graph
             this.value = value;
         }
 
-        public static Matrix<T> Multiply<T>(Matrix<T> a, Matrix<T> b) where T:struct
+        public static Matrix<T> operator *(Matrix<T> a, Matrix<T> b)
+            => Multiply(a, b);
+
+        public  Matrix<T> Pow(int power)
+        {
+            var rt = this;
+            for (var i = 1; i < power; i++)
+                rt = rt * rt;
+            return rt;
+        }
+
+        public override string ToString()
+        {
+            var rt = "";
+            for (var i = 0; i < Rows; i++)
+            {
+                rt += "|";
+
+                for (var j = 0; j < Columns - 1; j++)
+                    rt += value[i, j] + ",";
+
+                rt += value[i, Columns - 1] + "|";
+            }
+
+            return rt;
+        }
+
+        public static Matrix<T> Multiply<T>(Matrix<T> a, Matrix<T> b) where T : struct
         {
 
 
@@ -36,7 +62,9 @@ namespace Esiur.Analysis.Graph
                 { // bColumn
                     for (int k = 0; k < a.Columns; k++)
                     { // aColumn
-                        rt[i, j] += a[i, k] * b[k, j];
+                        dynamic aValue = a[i, k];
+                        dynamic bValue = b[k, j];
+                        rt[i, j] += aValue * bValue;// a[i, k] * b[k, j];
                     }
                 }
             }
diff --git a/Esiur.Analysis/Graph/Node.cs b/Esiur.Analysis/Graph/Node.cs
index 7740e4e..7523ced 100644
--- a/Esiur.Analysis/Graph/Node.cs
+++ b/Esiur.Analysis/Graph/Node.cs
@@ -10,5 +10,10 @@ namespace Esiur.Analysis.Graph
 
         public int X { get; set; }
         public int Y { get; set; }
+
+        public string Label { get; set; }
+        public List<Edge<T>> Destinations { get; } = new List<Edge<T>>();
+        public List<Edge<T>> Sources { get; } = new List<Edge<T>>();
+
     }
 }