用法及示例import numpy as np # 提取对角线元素 arr = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) diag_elements = np.diag(arr) print(diag_elements) # Output: [1 5 9] # 构造对角矩阵 diag_matrix = np.diag([1, 2, 3]) print(dia
# Create a 2D array (matrix) with 3 rows and 4 columns matrix = np.zeros((3, 4)) print(matrix) Output: [[0. 0. 0. 0.] [0. 0. 0. 0.] [0. 0. 0. 0.]] You can see the output in the screenshot below. Creating multi-dimensional arrays filled with zeros usingnp.zeros()...
o,对象, s,a,字符串,s24 u,unicode,u24 order:可选参数,c代表与c语言类似,行优先;F代表列优先 示例:生成4行10列的数组 import numpy as npfiles = [1,3,4,5]features_matrix = np.zeros((len(files), 10))print(features_matrix)参考:https://blog.csdn.net/qq_36621927/article/details/79763585 ...
# Create a 1-dimensional array arr = np.array([1, 2, 3, 4, 5, 6]) # Reshape the array to a 2x3 matrix reshaped_arr = np.reshape(arr, (2, 3)) [[1 2 3] [4 5 6]] numpy.transpose:用于排列数组的维度。它返回一个轴调换后的新数组。 # Create a 2-dimensional array arr = ...
zeros_arr=np.zeros((3,4))# np.ones ones_arr=np.ones((2,3))c=np.full((2,2),7)# Create a constant arrayprint(c)# Prints "[[7.7.]#[7.7.]]" d=np.eye(2)# Create a 2x2 identity matrixprint(d)# Prints "[[1.0.]#[0.1.]]" ...
函数zeros 创建一个全为零的数组,函数 ones 创建一个全为一的数组,函数 empty 创建一个初始内容是随机的数组,取决于内存状态。默认情况下,创建的数组的 dtype 是 float64,但可以通过关键字参数 dtype 指定。 >>> np.zeros((3, 4)) array([[0., 0., 0., 0.], [0., 0., 0., 0.], [0., ...
b = np.ones((1,2)) # Create an array of all ones print b # Prints "[[ 1. 1.]]" c = np.full((2,2), 7) # Create a constant array print c # Prints "[[ 7. 7.] # [ 7. 7.]]" d = np.eye(2) # Create a 2x2 identity matrix ...
Create a 5x5 matrix with row values ranging from 0 to 4 (★★☆) 创建一个5*5的矩阵,每一行值为0~4 z = np.zeros((5,5))z += np.arange(5)print(z) Create random vector of size 10 and replace the maximum value by 0 (★★☆) ...
1.What is the purpose of the numpy.zeros() function? The numpy.zeros() function is used to create a new array of given shape and type, filled with zeros. It's useful for initializing arrays before performing calculations or storing data. ...
[1,2,0,0,4,0])# Find indices of non-zero elementsprint(nz)# (array([0, 1, 4], dtype=int64),)"""上面是前十道题中不会的"""# identity matrix单位矩阵print(np.eye(3))# 3*3的单位矩阵# [[1. 0. 0.]# [0. 1. 0.]# [0. 0. 1.]]# Create a 2d array with 1 on the...