所有代码是，
import numpy as np
import matplotlib.pyplot as plt
#ubuntu 16.04 sudo pip instal matplotlib
plt.rcParams['figure.figsize'] = (10.0,8.0) # set default size of plots
plt.rcParams['image.interpolation'] = 'nearest'
plt.rcParams['image.cmap'] = 'qray'
np.random.seed(0)
N = 100 # number of points per class
D = 2 # dimensionality
K = 3 # number of classes
X = np.zeros((N*K,D))
y = np.zeros(N*K, dtype='uint8')
for j in range(K):
ix = range(N*j,N*(j+1))
r = np.linspace(0.0,1,N) # radius
t = np.linspace(j*4,(j+1)*4,N) + np.random.randn(N)*0.2 # theta
X[ix] = np.c_[r*np.sin(t),r*np.cos(t)]
y[ix] = j
fig = plt.figure()
plt.scatter(X[:,0],X[:,1], c=y, s=40, cmap=plt.cm.Spectral)
plt.xlim([-1,1])
plt.ylim([-1,1])
plt.show()
运行不了
解决方法是什么
