plot multiple arrows between scatter points

Question

I'm trying to plot multiple arrows between two sets of scatter points. Plotting a line is easy enough with ax.plot. But I'm trying to implement an arrow instead of a line. The arrows don't appear to be aligning between the points.

So if the line plot is initialised below, it works fine. But the quiver plot does not plot alone the same lines.

import pandas as pd
import matplotlib.pyplot as plt
import numpy as np

df = pd.DataFrame(np.random.randint(-50,50,size=(100, 4)), columns=list('ABCD'))

fig, ax = plt.subplots()

x1 = df['A']
y1 = df['B']

x2 = df['C']
y2 = df['D']

AB = plt.scatter(x1, y1, c = 'blue', marker = 'o', s = 10, zorder = 3)
CD = plt.scatter(x2, y2, c = 'red', marker = 'o', s = 10, zorder = 2)

# plot line between points
#ax.plot([x1,x2],[y1,y2], color = 'black', linestyle = '--', linewidth = 0.5)

ax.quiver([x1, x2], [y1, y2])

user_4238408 · Answer

According to the documentation, see scale_units option, you need: angles='xy', scale_units='xy', scale=1 in quiver:

AB = ax.scatter(x1, y1, c = 'blue', marker = 'o', s = 10, zorder = 3)
CD = ax.scatter(x2, y2, c = 'red', marker = 'o', s = 10, zorder = 2)

ax.quiver(x1, y1, (x2-x1), (y2-y1), angles='xy', scale_units='xy', scale=1)
plt.show()

Output:

plot multiple arrows between scatter points

1 Answers