Show direction arrows in a scatterplot

发布于 2020-07-01 15:49:49

I am plotting data in a scatterplot an I would like to see the direction of the hysteresis. Does anyone have a good idea how to implement arrows on each line that point into the direction of the next point?

Alternatively, the markers could be replaced by arrows pointing in the direction of the next point.

What I am looking for:

Code to obtain the plot (without arrows):

df = pd.DataFrame.from_dict({'x' : [0,3,8,7,5,3,2,1],
                             'y' : [0,1,3,5,9,8,7,5]})
x = df['x']
y = df['y']
fig, ax = plt.subplots()
ax.scatter(x,y)
ax.plot(x,y)

Questioner

NicoH

Viewed

Chinese

Original

import numpy as np import pandas as pd import matplotlib.pyplot as plt df = pd.DataFrame.from_dict({'x' : [0,3,8,7,5,3,2,1], 'y' : [0,1,3,5,9,8,7,5]}) x = df['x'].values y = df['y'].values u = np.diff(x) v = np.diff(y) pos_x = x[:-1] + u/2 pos_y = y[:-1] + v/2 norm = np.sqrt(u**2+v**2) fig, ax = plt.subplots() ax.plot(x,y, marker="o") ax.quiver(pos_x, pos_y, u/norm, v/norm, angles="xy", zorder=5, pivot="mid") plt.show()

Show direction arrows in a scatterplot

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