返回 NumPy 物件資料型別可以表示的最大值
要返回物件資料型別可以表示的最大值,請在 Python NumPy 中使用 **ma.minimum_fill_value()** 方法。此函式可用於計算適合獲取具有給定資料型別的陣列的最小值的填充值。它返回可表示的最大值。
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。
步驟
首先,匯入所需的庫 -
import numpy as np import numpy.ma as ma
使用 numpy.array() 方法建立包含整數元素的陣列 -
arr = np.array([[65, 68, 81], [93, 33, 76], [73, 88, 51], [62, 45, 67]])
print("Array...
", arr)建立掩碼陣列並將其中一些掩碼為無效 -
maskArr = ma.masked_array(arr, mask =[[1, 1, 0], [ 0, 0, 0], [0, 1, 0], [0, 1, 0]])
print("
Our Masked Array...
", maskArr)獲取掩碼陣列的型別 -
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("
Number of elements in the Masked Array...
",maskArr.size)要返回物件資料型別可以表示的最大值,請在 Python NumPy 中使用 ma.minimum_fill_value() 方法。此函式可用於計算適合獲取具有給定資料型別的陣列的最小值的填充值。
print("
Result..
",np.ma.minimum_fill_value(maskArr))
示例
# Python ma.MaskedArray - Return the maximum value that can be represented by the dtype of an object
import numpy as np
import numpy.ma as ma
# Create an array with int elements using the numpy.array() method
arr = np.array([[65, 68, 81], [93, 33, 76], [73, 88, 51], [62, 45, 67]])
print("Array...
", arr)
# Create a masked array and mask some of them as invalid
maskArr = ma.masked_array(arr, mask =[[1, 1, 0], [ 0, 0, 0], [0, 1, 0], [0, 1, 0]])
print("
Our Masked Array...
", maskArr)
# Get the type of the masked array
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("
Number of elements in the Masked Array...
",maskArr.size)
# To return the maximum value that can be represented by the dtype of an object, use the ma.minimum_fill_value() method in Python Numpy
# This function is useful for calculating a fill value suitable for taking the minimum of an array with a given dtype
# It returns the maximum representable value.
print("
Result..
",np.ma.minimum_fill_value(maskArr))輸出
Array... [[65 68 81] [93 33 76] [73 88 51] [62 45 67]] Our Masked Array... [[-- -- 81] [93 33 76] [73 -- 51] [62 -- 67]] Our Masked Array type... int64 Our Masked Array Dimensions... 2 Our Masked Array Shape... (4, 3) Number of elements in the Masked Array... 12 Result.. 9223372036854775807
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