how to draw or insert tangent line in my simulink result ie. speed Vs time graph ?

I would like to plot Tangent Line in my Simulink (simpowersystem) result ie. speed vs time graph.

Kindly help me..

Answer 1

[Fangjun Jiang]

If you have the speed and time data, you can use gradient() to get the acceleration.

ts=0.1;
t=0:ts:7;
Speed=sin(t);
Accel=gradient(Speed,ts);

plot(t,Speed,'r',t,Accel,'b');
legend({'Speed','Accel'});

If you want to get it directly in Simulink, use a Derivative block. You might need to consider filtering first to remove noise.

Or do you mean this?

ts=0.5;
t=0:ts:4;
Speed=sin(t);
Accel=gradient(Speed,ts);
dt=gradient(t,ts);

plot(t,Speed);
hold on;quiver(t,Speed,dt,Accel);