在 Numpy 中扩展数组在元组轴上的形状
要扩展数组的形状,请使用 **numpy.expand_dims()** 方法。插入一个新的轴,该轴将出现在扩展数组形状的轴位置。该函数返回输入数组的视图,其维度数量增加。
NumPy 提供了全面的数学函数、随机数生成器、线性代数例程、傅里叶变换等。它支持各种硬件和计算平台,并且与分布式、GPU 和稀疏数组库配合良好。
步骤
首先,导入所需的库 -
import numpy as np
使用 array() 方法创建数组 -
arr = np.array([[5, 10, 15], [20, 25, 30]])
显示数组 -
print("Our Array...
",arr)
显示数组的形状 -
print("
Array Shape...
",arr.shape)
检查维度 -
print("
Dimensions of our Array...
",arr.ndim)
获取数据类型 -
print("
Datatype of our Array object...
",arr.dtype)
获取数组中的元素数量 -
print("
Size of array...
",arr.size)
要扩展数组的形状,请使用 numpy.expand_dims() 方法 -
res = np.expand_dims(arr, axis=(0, 1))
显示扩展后的数组 -
print("
Resultant expanded array....
", res)
显示扩展后数组的形状 -
print("
Shape of the expanded array...
",res.shape)
检查维度 -
print("
Dimensions of our Array...
",res.ndim)
示例
import numpy as np # Creating an array using the array() method arr = np.array([[5, 10, 15], [20, 25, 30]]) # Display the array print("Our Array...
",arr) # Display the shape of array print("
Array Shape...
",arr.shape) # Check the Dimensions print("
Dimensions of our Array...
",arr.ndim) # Get the Datatype print("
Datatype of our Array object...
",arr.dtype) # Get the number of elements in an array print("
Size of array...
",arr.size) # To expand the shape of an array, use the numpy.expand_dims() method # Insert a new axis that will appear at the axis position in the expanded array shape. res = np.expand_dims(arr, axis=(0, 1)) # Display the expanded array print("
Resultant expanded array....
", res) # Display the shape of the expanded array print("
Shape of the expanded array...
",res.shape) # Check the Dimensions print("
Dimensions of our Array...
",res.ndim)
输出
Our Array... [[ 5 10 15] [20 25 30]] Array Shape... (2, 3) Dimensions of our Array... 2 Datatype of our Array object... int64 Size of array... 6 Resultant expanded array.... [[[[ 5 10 15] [20 25 30]]]] Shape of the expanded array... (1, 1, 2, 3) Dimensions of our Array... 4
广告