How to correctly draw 2D vectors?

Hey there,

I want to match the velocity vector arrows with the blue line of the graphic. The velocity vectors should have the same magnitude as the points in the blue line, but I can't understand why they don't match.

I would like something like this:

But, I all got is this:

This is my code:

% X=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]   %position on x axis
Y=[-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7];   %position on y axis
U=[2.19 3.79 8.00 13.15 16.64 16.97 17.11 17.25 17.34 17.25 13.27 8.00 3.58 1.79 0]; %velocity on x axis
V=[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]   %velocity on y axis

hold on;

plot(U,Y);

grid on

quiver(X,Y,U,V);

hold off

Answer 1

[Star Strider]

Add a ‘0’ to the quiver call to turn off the scaling:

quiver(X,Y,U,V,0)

That produces the plot you want. See the documentation on quiver for details.