MATLAB: Error using plot, vectors must be the same lengths

Question

g = 9.81;

theta = pi/4;

v = 400;

tmax = ((2*v*sin(theta))/g);

[x, y, t] = projectileMotion(400, pi/4);

[dfx] = derivative(t, y);

[ddfx] = derivative(t, dfx);

plot(y, dfx, ddfx)

xlabel('Time (sec)')

ylabel('y, dy, ddy')

title('Position, Velocity and Acceleration in vertical direction')

When i do this I get the error in the title, please help. Im calling functions that I have already made.

Answer 1

Plot() doesn't allow the syntax plot(y1,y2,y3). https://www.mathworks.com/help/matlab/ref/plot.html

If t, y, dfx, and ddfx are of same length, you can try:

plot(t,y,'r',t,dfx,'g',t,ddfx,'b');

Or use

hold on;