how to display a direction vector in matlab

I am trying to demonstrate some velocity data with their direction, basically want to combine velocity and direction in MATLAB. I would like to show the changes in velocity and direction in time. I was wondering if there is any function for that?

Thanks, Maryam

Answer 1

[Star Strider]

Not certain exactly what you want to do, but see if this gets you started:

v = linspace(0.01, 0.1, 10);    % Velocity
a = linspace(-90, 90, 10);      % Angle (degrees)

x = v.*cosd(a);                 % Create ‘x’ Coordinate
y = v.*sind(a);                 % Create ‘y’ Coordinate

dx = gradient(x);               % Create x-Direction Vector
dy = gradient(y);               % Create y-Direction Vector

figure(1)
quiver(x, y, dx, dy)
grid

I used degrees for the angles, and so sind and cosd. If you use radian measure, use sin and cos.

Answer 2

[José-Luis]

 doc quiver
 doc feather

Answer 3

[maryam]

Thanks José-Luis. As I know quiver and feather are useful whenever we have u,v and we want velocity vector. In my case, I have magnitude of velocities and angels which I want to show on a parametric curve. I am not sure if I can do it with these commands.