相关性
import pandas as pd
from pandas import set_option
iris=pd.read_csv('data/iris.csv')
set_option('precision', 2) # 设置数据的精确度
iris.corr(method='pearson') # 皮尔森相关性
correlations = iris.corr(method='pearson')
names = correlations.columns.tolist()
fig = plt.figure(figsize=(8, 8))
ax = fig.add_subplot(111)
cax = ax.matshow(correlations, vmin=-1, vmax=1)
fig.colorbar(cax)
ticks = np.arange(0, 4, 1)
ax.set_xticks(ticks)
ax.set_yticks(ticks)
ax.set_xticklabels(names)
ax.set_yticklabels(names)
plt.show()