<PYTHON>[Numpy_02 배열계산과 색인&슬이싱]

[Numpy_02 배열계산과 색인&슬이싱]

 

import numpy as np
 
# 배열 계산
arr1 = np.array([[1,2,3],[4,5,6]])
print(arr1)
print(arr1 + arr1)
print(arr1 - arr1)
print(arr1 * arr1)
print(arr1 / arr1)
print(1 / arr1)
print(arr1 ** 0.5)
 
# 색인&슬라이싱
arr1 = np.array([[[1,2,3],[4,5,6]],[[7,8,9],[10,11,12]]])
print(arr1)
print(arr1[0])
print(arr1[-1])
 
arr2 = arr1.copy()
arr1[0] = 77
arr1[-1] = 88
print(arr1)
print(arr2)
print(arr2[1,0])
print(arr2[-1,0])
 
arr3 = np.array([[1,2,3],[4,5,6],[7,8,9],[0,0,0]])
print(arr3[:2])
print(arr3[-2:])
print(arr3[2,:1])
print(arr3[:,:1])
 
arr3[:2,1:] = 0
print(arr3)

 

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