import numpy as np'''a = np.array([1,2,3])print(a)print(type(a))print(a.dtype)# 几行print(a.ndim)print(a.size)print(a.shape)print(a.data)''''''a = np.array([[1,2,3],[4,5,6]])b = np.array(((1,2,3),(4,5,6)))c = np.array([(1,2,3),(4,5,6)])print(a)print(b)print(c)print(np.zeros((3,3)))print(np.ones((3,3)))print(np.arange(4,10))print(np.arange(4,10,3))print(np.arange(4,10,0.5))# 开头和结尾所指定范围分成多少部分print(np.linspace(0,10,5))''''''A = np.arange(0,9).reshape(3,3)print(A)print(A+4)print(A*2)print(np.sin(A))print(np.sqrt(A))B = np.arange(12,21).reshape(3,3)print(A+B)print(A*B)# 矩阵的积print(np.dot(A,B))print(A.dot(B))print(np.dot(B,A))''''''a = np.arange(10,19).reshape(3,3)print(a)# 取单个值print(a[1,2])a = np.arange(1,17).reshape(4,4)print(a)# 切一行print(a[1,:])# 切一列print(a[:,2])# 抽取小矩阵print(a[0:3,1:4])# 抽取索引不连续print(a[[0,3],0:2])''''''# 数组迭代a = np.arange(11,27).reshape(4,4)print(a)# 遍历行# for row in a:#     print(row)# 遍历每一个元素# for i in a.flat:#     print(i)# 按列进行迭代(axis 控制行列)num = np.apply_along_axis(np.mean,axis=0,arr=a)print(num)# 按行进行迭代(计算每一行的平均数)num = np.apply_along_axis(np.mean,axis=1,arr=a)print(num)def foo(x):    return x/2num = np.apply_along_axis(foo,axis=0,arr=a)print(num)num = np.apply_along_axis(foo,axis=1,arr=a)print(num)''''''A = np.random.random((4,4))# 布尔数组print(A<0.5)# 抽取小于0.5的元素print(A[A<0.5])a = np.random.random(12)print(a)A = a.reshape(3,4)print(A)a.shape = (3,4)print(a)# 变回原型a = a.ravel()print(a)a.shape = (12)print(a)# 交换行列位置print(A.transpose())''''''A = np.ones((3,3))B = np.zeros((3,3))# 垂直连接print(np.vstack((A,B)))# 水平连接print(np.hstack((A,B)))A = np.arange(0,16).reshape(4,4)B = np.array([1,2,3,4])print(np.column_stack((A,B)))print(np.row_stack((A,B)))[B,C] = np.hsplit(A,2)print(B)print(C)[B,C] = np.vsplit(A,2)print(B)print(C)# 按列切分[A1,A2,A3] = np.split(A,[1,3],axis=1)print(A1)print(A2)print(A3)''''''a = np.array([1,2,3,4])b = aa[2] = 0print(b)c = a.copy()a[1] = 0print(a)print(c)# 注意与Python列表区分，列表操作得到的是副本a = np.array([1,2,3,4])c = a[0:2]print(c)a[0] = 0print(c)'''m = np.arange(6).reshape(3,1,2)n = np.arange(6).reshape(3,2,1)print(m)print(n)# 结构不同需扩展维度print(m+n)