"index exceeds matrix dimensions" using simulink

the following code is in regards to  rotational sytem with three storing elements using simulink to plot for angular velocities an torque. after y_out(:,1) however, it keeps showing that the index exceeds matrix dimensions. Any help? simulink file is attached 


clc
clear all
m1=1;
m2=3; %this is the mass in kg
k=330;
r1=.03;
r2=.1;
b=.2; 
J1=.5*m1*r2^2;
J2 = J1;
N=r2/r1;

A = [0 1 -1 ;-k/J1 0 0; k/J2 0 -b/J2];
B = [0 ; N/J1 ;0];
C=[0 0 1];
D=[0]';
x0= [0]';
tf=30;
t1 = [0:0.01:tf];
%t1 = [0:0.01:1]
F = 10 ;
u=F*ones(size(t1));
%u=F*cos(t1)
sim('HW2_SimLink')
cart_po = y_out(:,1);
cart_vel = y_out(:,2);
cart_po1 = y_out(:,3);
cart_vel1 = y_out(:,4);

figure(1)
plot(t1,cart_po,'-b','linewidth',1.5)
xlabel('Time (seconds)','fontsize',14)
ylabel('Position m1 (m)','fontsize',14)
grid,  

figure(2)
plot(t1,cart_vel,'-r','linewidth',1.5);
%legend('Position','Velocity')
xlabel('Time (seconds)','fontsize',14)
ylabel('Velocity m1 (m/s)','fontsize',14)
grid, hold

figure(3)
plot(t1,cart_po1,'-g','linewidth',1.5)
xlabel('Time (seconds)','fontsize',14)
ylabel('Position m2 (m)','fontsize',14)
grid, hold

figure(4)
plot(t1,cart_vel1,'-k','linewidth',1.5);
%legend('Position','Velocity')
xlabel('Time (seconds)','fontsize',14)
ylabel('Velocity m2 (m/s)','fontsize',14)
grid, hold

Answer 1

[Sai Sri Pathuri]

The model is generating an output y_out of size 5099x1 (i.e., 5099 rows and 1 column). But you are trying to access 2nd, 3rd and 4th columns which does not exist.