pd.tools.plotting.scatter_matrix返回绘制轴的数组；左下边界轴对应于索引[:,0]和[-1,:]。可以遍历这些元素并进行各种修改。例如：
axs = pd.tools.plotting.scatter_matrix(df, diagonal='kde')
def wrap(txt, width=8):
'''helper function to wrap text for long labels'''
import textwrap
return '\n'.join(textwrap.wrap(txt, width))
for ax in axs[:,0]: # the left boundary
ax.grid('off', axis='both')
ax.set_ylabel(wrap(ax.get_ylabel()), rotation=0, va='center', labelpad=20)
ax.set_yticks([])
for ax in axs[-1,:]: # the lower boundary
ax.grid('off', axis='both')
ax.set_xlabel(wrap(ax.get_xlabel()), rotation=90)
ax.set_xticks([])
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