获取NumPy中掩码数组的当前形状


要获取掩码数组的形状,请使用NumPy中的ma.MaskedArray.shape属性。shape属性通常用于获取数组的当前形状,但也可以通过为其赋值一个数组维度的元组来就地重塑数组。

与numpy.reshape一样,新的形状维度之一可以是-1,在这种情况下,它的值将根据数组的大小和其余维度推断得出。如果需要复制,则就地重塑数组将失败。

步骤

首先,导入所需的库:

import numpy as np
import numpy.ma as ma

使用numpy.array()方法创建一个数组:

arr = np.array([[35, 85], [67, 33]])
print("Array...
", arr) print("
Array type...
", arr.dtype)

获取数组的维度:

print("Array Dimensions...
",arr.ndim)

获取消耗的总字节数:

print("Array nbytes...
",arr.nbytes)

创建一个掩码数组,并将其中一些标记为无效:

maskArr = ma.masked_array(arr, mask =[[0, 0], [ 0, 1]])
print("
Our Masked Array
", maskArr) print("
Our Masked Array type...
", maskArr.dtype)

获取掩码数组的itemsize:

print("
Our Masked Array itemsize...
", maskArr.itemsize)

获取掩码数组的维度:

print("
Our Masked Array Dimensions...
",maskArr.ndim)

获取掩码数组的形状,使用NumPy中的ma.MaskedArray.shape属性:

print("
Our Masked Array Shape...
",maskArr.shape)

示例

import numpy as np
import numpy.ma as ma
arr = np.array([[35, 85], [67, 33]])
print("Array...
", arr) print("
Array type...
", arr.dtype) print("
Array itemsize...
", arr.itemsize) # Get the dimensions of the Array print("Array Dimensions...
",arr.ndim) # Get the total bytes consumed print("Array nbytes...
",arr.nbytes) # Create a masked array and mask some of them as invalid maskArr = ma.masked_array(arr, mask =[[0, 0], [ 0, 1]]) print("
Our Masked Array
", maskArr) print("
Our Masked Array type...
", maskArr.dtype) # Get the itemsize of the Masked Array print("
Our Masked Array itemsize...
", maskArr.itemsize) # Get the dimensions of the Masked Array print("
Our Masked Array Dimensions...
",maskArr.ndim) # To get the shape of the Masked Array, use the ma.MaskedArray.shape attribute in Numpy print("
Our Masked Array Shape...
",maskArr.shape)

输出

Array...
[[35 85]
[67 33]]

Array type...
int64

Array itemsize...
8
Array Dimensions...
2
Array nbytes...
32

Our Masked Array
[[35 85]
[67 --]]

Our Masked Array type...
int64

Our Masked Array itemsize...
8

Our Masked Array Dimensions...
2

Our Masked Array Shape...
(2, 2)

更新于:2022年2月17日

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