Numpy入门

本节主要讲解numpy数组的基本运算，包括两数组相加、相减、相乘和相除。

一、两数组相加add

import numpy as np
arr1 = np.array([[1, 2, 3], [4, 5, 6]])
arr2 = np.array([[1, 2, 1], [2, 1, 2]])
result = np.add(arr1, arr2)
print(result)

[[2 4 4]
 [6 6 8]]

二、两数组相减subtract

import numpy as np
arr1 = np.array([[1, 2, 3], [4, 5, 6]])
arr2 = np.array([[1, 2, 1], [2, 1, 2]])
result = np.subtract(arr1, arr2)
print(result)

[[0 0 2]
 [2 4 4]]

三、两数组相乘multiply

import numpy as np
arr1 = np.array([[1, 2, 3], [4, 5, 6]])
arr2 = np.array([[1, 2, 1], [2, 1, 2]])
result = np.multiply(arr1, arr2)
print(result)

[[ 1  4  3]
 [ 8  5 12]]

四、两数组相除floor_divide

import numpy as np
arr1 = np.array([[1, 2, 3], [4, 5, 6]])
arr2 = np.array([[1, 2, 1], [2, 1, 2]])
result = np.floor_divide(arr1, arr2) #如果不取整，用floor
print(result)

[[1 1 3]
 [2 5 3]]

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