Mastering Matplotlib 2.x

Making vector plots with quiver

We want to plot both the X and the Y changes together. For this, we can use the quiver method. To use the quiver method, insert the (phi) [1] and (phi) [0] gradients into the gradient method. When we call this default set of arguments, the x and y positions, as well as the length of the x and y vectors we provide, will create the following vector field:

# Vectors with quiverplt.imshow(phi, extent=(0,10,0,10), interpolation='none', origin='lower')plt.quiver(x, y, np.gradient(phi)[0], np.gradient(phi)[1])

Following is the output of the preceding code:

We can also change the scale. Usually, after passing a scale ...