返回 NumPy 对象数据类型可以表示的最大值
要返回对象数据类型可以表示的最大值,请在 Python NumPy 中使用 **ma.minimum_fill_value()** 方法。此函数可用于计算适合获取具有给定数据类型的数组的最小值的填充值。它返回可表示的最大值。
掩码数组是标准 numpy.ndarray 和掩码的组合。掩码要么是 nomask,表示关联数组的任何值均无效,要么是布尔值数组,用于确定关联数组的每个元素的值是否有效。
步骤
首先,导入所需的库 -
import numpy as np import numpy.ma as ma
使用 numpy.array() 方法创建包含整数元素的数组 -
arr = np.array([[65, 68, 81], [93, 33, 76], [73, 88, 51], [62, 45, 67]])
print("Array...
", arr)创建掩码数组并将其中一些掩码为无效 -
maskArr = ma.masked_array(arr, mask =[[1, 1, 0], [ 0, 0, 0], [0, 1, 0], [0, 1, 0]])
print("
Our Masked Array...
", maskArr)获取掩码数组的类型 -
print("
Our Masked Array type...
", maskArr.dtype)
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 -
print("
Our Masked Array Shape...
",maskArr.shape)
获取掩码数组的元素数量 -
print("
Number of elements in the Masked Array...
",maskArr.size)要返回对象数据类型可以表示的最大值,请在 Python NumPy 中使用 ma.minimum_fill_value() 方法。此函数可用于计算适合获取具有给定数据类型的数组的最小值的填充值。
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))输出
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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