比较两个NumPy数组,并返回忽略NaN的逐元素最小值


要比较两个数组并返回忽略NaN的逐元素最小值,请在Python NumPy中使用**numpy.fmin()**方法。返回值为True或False。

比较两个数组,并返回一个新数组,其中包含逐元素最大值。如果被比较的元素之一是NaN,则返回非NaN元素。如果两个元素都是NaN,则返回第一个。后一种区别对于复数NaN很重要,复数NaN定义为实部或虚部至少有一个是NaN。其最终效果是,尽可能忽略NaN。

步骤

首先,导入所需的库:

import numpy as np

使用array()方法创建两个二维NumPy数组。我们插入了一些包含NaN值的元素:

arr1 = np.array([[6, 9, np.NaN],[25, 11, 21]])
arr2 = np.array([[8, np.NaN, np.NaN],[22, 19, 26]])

显示数组:

print("Array 1...
", arr1) print("
Array 2...
", arr2)

获取数组的类型:

print("
Our Array 1 type...
", arr1.dtype) print("
Our Array 2 type...
", arr2.dtype)

获取数组的维度:

print("
Our Array 1 Dimensions...
",arr1.ndim) print("
Our Array 2 Dimensions...
",arr2.ndim)

获取数组的形状:

print("
Our Array 1 Shape...
",arr1.shape) print("
Our Array 2 Shape...
",arr2.shape)

要比较两个数组并返回忽略NaN的逐元素最小值,请在Python NumPy中使用numpy.fmin()方法。返回值为True或False:

print("
Result (minimum ignoring NaNs)...
",np.fmin(arr1, arr2))

示例

import numpy as np

# Creating two 2D numpy array using the array() method
# We have inserted elements with some NaN values
arr1 = np.array([[6, 9, np.NaN],[25, 11, 21]])
arr2 = np.array([[8, np.NaN, np.NaN],[22, 19, 26]])

# Display the arrays
print("Array 1...
", arr1) print("
Array 2...
", arr2) # Get the type of the arrays print("
Our Array 1 type...
", arr1.dtype) print("
Our Array 2 type...
", arr2.dtype) # Get the dimensions of the Arrays print("
Our Array 1 Dimensions...
",arr1.ndim) print("
Our Array 2 Dimensions...
",arr2.ndim) # Get the shape of the Arrays print("
Our Array 1 Shape...
",arr1.shape) print("
Our Array 2 Shape...
",arr2.shape) # To compare two arrays and return the element-wise minimum ignoring NaNs, use the numpy.fmin() method in Python Numpy # Return value is either True or False print("
Result (minimum ignoring NaNs)...
",np.fmin(arr1, arr2))

输出

Array 1...
[[ 6. 9. nan]
[25. 11. 21.]]

Array 2...
[[ 8. nan nan]
[22. 19. 26.]]

Our Array 1 type...
float64

Our Array 2 type...
float64

Our Array 1 Dimensions...
2

Our Array 2 Dimensions...
2

Our Array 1 Shape...
(2, 3)

Our Array 2 Shape...
(2, 3)

Result (minimum ignoring NaNs)...
[[ 6. 9. nan]
[22. 11. 21.]]

更新于:2022年2月7日

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