矢印プロットと装飾

装飾を加えて矢印を表示する例。

../../../_images/plot_quiver_1.png

Python ソースコード: plot_quiver.py

import numpy as np

import matplotlib.pyplot as plt



n = 8

X, Y = np.mgrid[0:n, 0:n]

T = np.arctan2(Y - n/ 2., X - n / 2.)

R = 10 + np.sqrt((Y - n / 2.) ** 2 + (X - n / 2.) ** 2)

U, V = R * np.cos(T), R * np.sin(T)



plt.quiver(X, Y, U, V, R, alpha=.5)

plt.quiver(X, Y, U, V, edgecolor='k', facecolor='None', linewidth=.5)



plt.xlim(-1, n)

plt.xticks(())

plt.ylim(-1, n)

plt.yticks(())



plt.text(-0.05, 1.02, " Quiver Plot:    plt.quiver(...)\n",

      horizontalalignment='left',

      verticalalignment='top',

      size='xx-large',

      bbox=dict(facecolor='white', alpha=1.0, width=400, height=65),

      transform=plt.gca().transAxes)



plt.text(-0.05, 1.01, "\n\n    Plot a 2-D field of arrows ",

      horizontalalignment='left',

      verticalalignment='top',

      size='large',

      transform=plt.gca().transAxes)



plt.show()

Total running time of the example: 0.06 seconds ( 0 minutes 0.06 seconds)