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#coding:utf-8import numpy as npb=np.arange(12).reshape(3,4)print(b.flat)for i in b.flat:    print(i)f=b.flatb.flat=7print(b)a=[1,2,3]b=[4,5,6]c=(a,b)print(np.ix_(a,b))f=np.arange(12)print(f%4==0)v=np.array([[1,2,3],[4,5,6]])print("v:",v)v[np.ix_(range(2),range(2))]=0print(v)'''输出:[[0 0 3] [0 0 6]]'''v2=np.array([[1,2,3],[4,5,6]])v2[range(2),range(2)]=0#v[v>1]=0print(v2)'''输出：[[0 2 3] [4 0 6]]'''#改变元素的值v2=np.array([[1,2,3],[4,5,6]])#v2[range(2),range(2)]=0v2[(v2>1) & (v2 <5)]=0print(v2)'''输出：[[1 0 0] [0 5 6]]'''

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