Phase plot adding direction arrows

Brilliant Purnawan

2020 11 3

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Screen Shot 2020-11-03 at 19.30.10.png

Hi, need some help regarding adding arrows in velocity plot. So my current plot based on the script extract below yields, the "angular velocity graph" (Don't mind the axis name its suppose to be theta), is there a way to add arrows for the velocity directions? I'm visualizing of something like the second image below.

clear all, close all, clc
m = 0.25;
M = 0.635;
l = 0.5;
g = -9.81;
b = 1;
tspan = 0:.001:50;
y0 = [0; -.01; -pi; 0];
[t,y] = ode45(@(t,y)Equation(y,m,M,l,g,b,0),tspan,y0);
g = y(:,3);
figure(2);
plot(y(:,3),y(:,4));
title('Angular Velocity Graph')
xlabel('Time (s)')
ylabel('Angular Velocity (rad s^{-1})')
function dy = Equation(y,m,M,l,g,b,u)
    Sinx = sin(y(3));
    Cosx = cos(y(3));
    a = ((M+m)*l-m*l*Cosx^2);
    dy(1,1) = y(2);
    dy(2,1) = (u*l-b*y(2)*l-m*g*l*Cosx*Sinx+m*l^2*y(4)^2*Sinx)/a;
    dy(3,1) = y(4);
    dy(4,1) = (g*Sinx*(M+m)+Cosx*b*y(2)-Cosx*u-m*l*y(4)^2*Sinx*Cosx)/a;
end