import numpy as nparr1 = np.array([1, 2, 3, 4])
print(arr1)
arr2 = np.array([[1, 2, 3, 1], [4, 5, 6, 3], [4, 8, 9, 10]])
print(arr2)
np_linspace = np.linspace(0, 1, 12)
print(np_linspace)#矩阵的生成
np_zeros = np.zeros((2, 3))
print(np_zeros)
np_eye = np.eye(3)
print(np_eye)
np_diag = np.diag([1, 2, 3, 4])
print(np_diag)# 数组的属性
print(arr2.shape)
print(arr2.ndim)
print(arr2.size)
print(arr2.dtype)
print(arr2.itemsize)#类型转换
print(np.float(32))
print(np.int8(34))
print(bool(0))
print(np.float(True))
print(np.float(False))#数组下标查找
print(arr2[2][:2])
print(arr2[0, 0:3])#数组形状
arr2.shape = 4, 3
print(arr2)
print(arr1.reshape(2,2))
arr_1 = np.arange(24).reshape(4,6)
print(arr_1)
print(arr_1.ravel())
print(arr_1.flatten()) # 横向
print(arr_1.flatten('F')) # 纵向#改变数组
arr3 = np.array([5,6,7,8])
print(np.hstack((arr1,arr3)))
print(np.vstack((arr1,arr3)))
print(np.concatenate((arr1,arr3),axis=0))#数组切割
print(np.hsplit(arr3,2))
print(np.vsplit(arr2,2))
print(np.split(arr2,2,axis=0))#随机生成数字
print(np.random.random(100))
print(np.random.rand(10,5))
print(np.random.randn(10,5))
print(np.random.randint(2,10,size=[2,5]))#矩阵生成与运算
maty1 = np.mat('1,2,3;4,5,6;7,8,9')
print(maty1)
maty2 = np.matrix([[1,2,3],[4,5,6],[7,8,9]])
print(maty2)
print(maty2*3)
print(maty2+maty1)
print(maty2*maty1)
print(np.dot(maty2,maty1))
print(maty1.T)
print(maty1.H)
print(maty1.I)