Graphics

Three-Dimensional Quiver Plots

Three-dimensional quiver plots (quiver3) display vectors consisting of (u,v,w) components at (x,y,z) locations. For example, you can show the path of a projectile as a function of time,

First, assign values to the constants vz and a.

vz = 10;            % Velocity
a = -32;            % Acceleration

Then, calculate the height z, as time varies from 0 to 1 in increments of 0.1.

t = 0:.1:1;
z = vz*t + 1/2*a*t.^2;

Calculate the position in the x and y directions.

vx = 2;
x = vx*t;
vy = 3;
y = vy*t;

Compute the components of the velocity vectors and display the vectors using the 3-D quiver plot.

u = gradient(x);
v = gradient(y);
w = gradient(z);
scale = 0;
quiver3(x,y,z,u,v,w,scale)
axis square

Two-Dimensional Quiver Plots

Contour Plots