diff --git a/Design_Nass.m b/Design_Nass.m
index ef7961c..10bd879 100644
--- a/Design_Nass.m
+++ b/Design_Nass.m
@@ -1,5 +1,7 @@
 %% Nass height
-Nass.h = 90 ; %mm
+Nass = struct();
+Nass.h = 90; %mm
+Nass.jacobian = 174.5; %mm
 
 %% Bottom Plate
 BP = struct();
diff --git a/Formule_Nass.m b/Formule_Nass.m
index 291352c..7a9c551 100644
--- a/Formule_Nass.m
+++ b/Formule_Nass.m
@@ -1,7 +1,6 @@
 %%
 clear;
 clc;
-
 %%
 run Design_Nass.m
 
@@ -20,7 +19,7 @@ alpha_t = TP.leg.ang*deg2rad; % +- offset angle from 120 degree spacing on top
 height = (Nass.h-BP.thickness-TP.thickness-Leg.sphere.bottom-Leg.sphere.top-SP.thickness.bottom-SP.thickness.top)*0.001 ; % 2 meter height in home configuration
 radius_b = BP.leg.rad*0.001; % rayon emplacement support base
 radius_t = TP.leg.rad*0.001; % top radius in meters
-for i = 1:3,
+for i = 1:3
   % base points
   angle_m_b = (2*pi/3)* (i-1) - alpha_b;
   angle_p_b = (2*pi/3)* (i-1) + alpha_b;
@@ -44,7 +43,7 @@ body_pts = pos_top' - height*[zeros(2,6);ones(1,6)];
 legs = pos_top - pos_base;
 leg_length = [ ];
 leg_vectors = [ ];
-for i = 1:6,
+for i = 1:6
   leg_length(i) = norm(legs(i,:));
   leg_vectors(i,:)  = legs(i,:) / leg_length(i);
 end
@@ -52,7 +51,7 @@ end
 Leg.lenght = 1000*leg_length(1)/1.5;
 
 % Calculate revolute and cylindrical axes
-for i = 1:6,
+for i = 1:6
   rev1(i,:) = cross(leg_vectors(i,:), z_axis);
   rev1(i,:) = rev1(i,:) / norm(rev1(i,:));
   rev2(i,:) = - cross(rev1(i,:), leg_vectors(i,:));
@@ -67,11 +66,14 @@ end
 lower_leg = struct('origin', [0 0 0], 'rotation', eye(3), 'end_point', [0 0 0]);
 upper_leg = struct('origin', [0 0 0], 'rotation', eye(3), 'end_point', [0 0 0]);
 
-for i = 1:6,
-  lower_leg(i).origin = pos_base(i,:) + (3/8)*legs(i,:);  
-  lower_leg(i).end_point = pos_base(i,:) +  (3/4)*legs(i,:);  
+for i = 1:6
+  lower_leg(i).origin = pos_base(i,:) + (3/8)*legs(i,:);
+  lower_leg(i).end_point = pos_base(i,:) +  (3/4)*legs(i,:);
   lower_leg(i).rotation = [rev1(i,:)', rev2(i,:)', cyl1(i,:)'];
   upper_leg(i).origin = pos_base(i,:) + (1-3/8)*legs(i,:);
-  upper_leg(i).end_point = pos_base(i,:) +  (1/4)*legs(i,:);  
+  upper_leg(i).end_point = pos_base(i,:) +  (1/4)*legs(i,:);
   upper_leg(i).rotation = [rev1(i,:)', rev2(i,:)', cyl1(i,:)'];
-end
\ No newline at end of file
+end
+
+%%
+run JacobianMatrix.m
\ No newline at end of file
diff --git a/JacobianMatrix.m b/JacobianMatrix.m
new file mode 100644
index 0000000..46ee678
--- /dev/null
+++ b/JacobianMatrix.m
@@ -0,0 +1,27 @@
+%% Position Matrix
+M_pos_base = pos_base + (height+(TP.thickness+Leg.sphere.top+SP.thickness.top+Nass.jacobian)*1e-3)*[zeros(6, 2),ones(6, 1)];
+
+%% Rotation Matrix
+RM = leg_vectors;
+
+%%
+J  = computeJacobian(RM, M_pos_base);
+
+ %% Jacobian Matrix
+ function J  = computeJacobian(RM,M_pos_base)
+     J = zeros(6);
+     J(:, 1:3) = RM;
+     for i = 1:6
+         J(i, 4:6) = -RM(i, :)*getCrossProductMatrix(M_pos_base(i, :));
+     end
+ 
+     function M = getCrossProductMatrix(v)
+         M = zeros(3);
+         M(1, 2) = -v(3);
+         M(1, 3) =  v(2);
+         M(2, 3) = -v(1);
+         M(2, 1) = -M(1, 2);
+         M(3, 1) = -M(1, 3);
+         M(3, 2) = -M(2, 3);
+     end
+ end
\ No newline at end of file
diff --git a/Nass_Matlab.slx b/Nass_Matlab.slx
index 6c084e0..64e51c4 100644
Binary files a/Nass_Matlab.slx and b/Nass_Matlab.slx differ