Matplotlib Quiver Key Label Getting Cut

When copying the example in the docs the label associated with the quiver key is not showing up. Any thoughts? Edit: Thanks all for your responses. @X helped me realize the differe

Solution 1:

My guess is that somehow your backend is changing the figure size on you and that moves the quiver key. Why do you want it in figure co-ordinates? Suggest you position it relative to the axes:

import matplotlib.pyplot as plt
import numpy as np

X, Y = np.meshgrid(np.arange(0, 2 * np.pi, .2), np.arange(0, 2 * np.pi, .2))
U = np.cos(X)
V = np.sin(Y)

fig1, ax1 = plt.subplots()
ax1.set_title('Arrows scale with plot width, not view')
Q = ax1.quiver(X, Y, U, V, units='width')
qk = ax1.quiverkey(Q, 1.0, 1.02, 2, r'$2 \frac{m}{s}$', labelpos='E',
                   coordinates='axes')
plt.show()

Solution 2:

There is a difference between using a coordinate reference as an axis and a figure. The background color of the figure is pink and the background color of the axis is yellow.

qk = ax1.quiverkey(Q, 0.85, 0.9, 2, r'$2 \frac{m}{s}$', labelpos='E', coordinates='figure')

qk = ax1.quiverkey(Q, 0.85, 0.9, 2, r'$2 \frac{m}{s}$', labelpos='E', coordinates='axes')

Solution 3:

When in doubt, tight_layout! (it's a bit of a quick/easy fix, vs. fiddling forever with various margin attributes)

import matplotlib.pyplot as plt
import numpy as np

X, Y = np.meshgrid(np.arange(0, 2 * np.pi, .2), np.arange(0, 2 * np.pi, .2))
U = np.cos(X)
V = np.sin(Y)

fig1, ax1 = plt.subplots()
ax1.set_title('Arrows scale with plot width, not view')
Q = ax1.quiver(X, Y, U, V, units='width')
qk = ax1.quiverkey(Q, 0.92, .95, 2, r'$2 \frac{m}{s}$', labelpos='E',
                   coordinates='figure')
plt.tight_layout()
plt.show()

Solution 4:

I believe you need to modify the coordinates of the key manually for different figsize. For the default (6,4):

qk = ax1.quiverkey(Q, 0.93, 0.93, 2, r'$2 \frac{m}{s}$', labelpos='E',
                   coordinates='figure')
plt.tight_layout()

gives: