python在scatter中添加图例_如何向matplotlib散点图添加图例

看起来你在画两种颜色之间摆动的每个点。根据这个问题的答案subsampling every nth entry in a numpy array您可以使用numpys数组切片来绘制两个独立的数组，然后像正常一样进行图例。

对于一些示例数据：import numpy as np

import numpy.random as nprnd

import matplotlib.pyplot as plt

A = nprnd.randint(1000, size=100)

A.shape = (50,2)

x1, x2 = np.sort(A[:,0], axis=0), np.sort(A[:,1], axis=0)

x1

Out[50]:

array([ 46, 63, 84, 96, 118, 127, 137, 142, 181, 187, 187, 207, 210,

238, 238, 330, 334, 335, 346, 346, 350, 392, 400, 426, 467, 531,

550, 567, 569, 572, 583, 625, 637, 661, 671, 677, 698, 713, 777,

796, 837, 850, 866, 868, 874, 890, 919, 972, 992, 993])

x2

Out[51]:

array([ 2, 44, 49, 51, 72, 84, 86, 118, 120, 133, 150, 155, 156,

159, 199, 202, 250, 281, 289, 317, 317, 386, 405, 414, 427, 461,

507, 510, 543, 552, 553, 555, 559, 576, 618, 622, 633, 647, 665,

672, 682, 685, 745, 767, 776, 802, 808, 813, 847, 973])

labels=['blue','red']

fig, ax1 = plt.subplots()

ax1.scatter(x1[0::2], x2[0::2], 100, edgecolors='none', c='red', label = 'red')

ax1.scatter(x1[1::2], x2[1::2], 100, edgecolors='none', c='black', label = 'black')

plt.legend()

plt.show()

对于您的代码，您可以执行以下操作：sns.set(style = 'darkgrid')

fig, ax1 = sns.plt.subplots()

x1, x2 = X_bar[:,0], X_bar[:,1]

ax1.scatter(x1[0::2], x2[0::2], 100, edgecolors='none', c = colors[0], label='one')

ax1.scatter(x1[1::2], x2[1::2], 100, edgecolors='none', c = colors[1], label='two')

fig.set_figheight(8)

fig.set_figwidth(15)

plt.legend()