在 NumPy 中獲取標量值與掩碼陣列中每個元素的模
要獲取標量值與掩碼陣列中每個元素的模,請在 Python NumPy 中使用 **ma.MaskedArray.__rmod__()** 方法。掩碼陣列是標準 numpy.ndarray 和掩碼的組合。掩碼要麼是 nomask,表示關聯陣列的任何值均無效,要麼是布林值陣列,用於確定關聯陣列的每個元素的值是否有效。
NumPy 提供了全面的數學函式、隨機數生成器、線性代數例程、傅立葉變換等等。它支援各種硬體和計算平臺,並且可以很好地與分散式、GPU 和稀疏陣列庫配合使用。
步驟
首先,匯入所需的庫 -
import numpy as np import numpy.ma as ma
使用 numpy.array() 方法建立具有整數元素的陣列 -
arr = np.array([[85, 68, 81, 84], [67, 33, 35, 53], [29, 105, 51, 37], [70, 45, 67, 85]])
print("Array...
", arr)
print("
Array type...
", arr.dtype)獲取陣列的維度 -
print("Array Dimensions...
",arr.ndim)
建立掩碼陣列並將其中的某些元素標記為無效 -
maskArr = ma.masked_array(arr, mask =[[1, 1, 0, 0], [ 0, 0, 1, 0], [0, 0, 0, 1], [0, 1, 0, 0]])
print("
Our Masked Array
", maskArr)
print("
Our Masked Array type...
", maskArr.dtype)獲取掩碼陣列的維度 -
print("
Our Masked Array Dimensions...
",maskArr.ndim)
獲取掩碼陣列的形狀 -
print("
Our Masked Array Shape...
",maskArr.shape)獲取掩碼陣列的元素數量 -
print("
Elements in the Masked Array...
",maskArr.size)
標量 -
val = 35
print("
The given value...
",val)要獲取標量值與掩碼陣列中每個元素的模,請使用 ma.MaskedArray.__rmod__() 方法 -
print("
Resultant Masked Array...
",maskArr.__rmod__(val))
示例
import numpy as np
import numpy.ma as ma
# Create an array with int elements using the numpy.array() method
arr = np.array([[85, 68, 81, 84], [67, 33, 35, 53], [29, 105, 51, 37], [70, 45, 67, 85]])
print("Array...
", arr)
print("
Array type...
", arr.dtype)
# Get the dimensions of the Array
print("
Array Dimensions...
",arr.ndim)
# Create a masked array and mask some of them as invalid
maskArr = ma.masked_array(arr, mask =[[1, 1, 0, 0], [ 0, 0, 1, 0], [0, 0, 0, 1], [0, 1, 0, 0]])
print("
Our Masked Array
", maskArr)
print("
Our Masked Array type...
", maskArr.dtype)
# Get the dimensions of the Masked Array
print("
Our Masked Array Dimensions...
",maskArr.ndim)
# Get the shape of the Masked Array
print("
Our Masked Array Shape...
",maskArr.shape)
# Get the number of elements of the Masked Array
print("
Elements in the Masked Array...
",maskArr.size)
# The scalar
val = 35
print("
The given value...
",val)
# To get the mod of a scalar value with every element of a masked Array, use the ma.MaskedArray.__rmod__() method
print("
Resultant Masked Array...
",maskArr.__rmod__(val))輸出
Array... [[ 85 68 81 84] [ 67 33 35 53] [ 29 105 51 37] [ 70 45 67 85]] Array type... int64 Array Dimensions... 2 Our Masked Array [[-- -- 81 84] [67 33 -- 53] [29 105 51 --] [70 -- 67 85]] Our Masked Array type... int64 Our Masked Array Dimensions... 2 Our Masked Array Shape... (4, 4) Elements in the Masked Array... 16 The given value... 35 Resultant Masked Array... [[-- -- 35 35] [35 2 -- 35] [6 35 35 --] [35 -- 35 35]]
廣告
資料結構
網路
關係資料庫管理系統
作業系統
Java
iOS
HTML
CSS
Android
Python
C 程式設計
C++
C#
MongoDB
MySQL
Javascript
PHP