[python] numpy 함수들

import numpy as np

# array(...)

arr = np.array([1,2,3]) # 1 dimension array

arr = np.array([[1,2,3],[4,5,6]], np.int32) # 2 dimension array as type int32

# zeros((w, h, ...)) # empty array

arr2 = np.zeros((2,3), np.float32) # == [[0,0,0],[0,0,0]] as type float32

# arange(n)

arr3 = np.arange(10) # == [0,1,2,...9]

# reshape(w, h, ...)

arr3 = arr3.reshape(2,5) # == [[0,1,2,3,4],[5,6,7,8,9]]

---

# swapaxes()

arr.shape # (2, 3)

arr = arr.swapaxes(0, 1) # axe 0와 axe 1을 swap함

arr.shape # (3, 2) # shape을 통해 바뀐 axe 쉽게 확인가능