见https://matplotlib.org/devdocs/api/_as_gen/matplotlib.pyplot.scatter.html

matplotlib.pyplot.scatter(x, y, s=None, c=None, marker=None, cmap=None, norm=None, vmin=None, vmax=None, alpha=None, linewidths=None, verts=None, edgecolors=None, hold=None, data=None, **kwargs)

原文summarize的很好：

• Make a scatter plot of x vs y.
• Marker size is scaled by s and marker color is mapped to c。

我的应用案例

import matplotlib.pyplot as pltfrom matplotlib.colors import ListedColormapplt.figure()plt.title('Sample regression problem with one input variable')#黄绿蓝cmap_bold = ListedColormap(['#FFFF00', '#00FF00', '#0000FF'])plt.scatter(XTrain[:,0], XTrain[:,1], c=yTrain,marker= 'o', s=50, cmap=cmap_bold)plt.show()

结果显示

 

 plot的目的是想通过数据观察特征，选取特征，之后还会进行更多对特征的分析