1. introduction

from numpy import *

random.rand(4,4)

#array to matrix

randMat=mat(randon.rand(4,4))

#matrix inverse

IvrandMat=randMat.I

#indentity matrix

eye(4) # 4*4 identity matrix

randMat*IvrandMat

2. knn

python in action,布布扣,bubuko.com

python in action