[python3] numpy.reshape

https://numpy.org/doc/stable/reference/generated/numpy.matrix.reshape.html

https://numpy.org/doc/stable/reference/generated/numpy.reshape.html#numpy.reshape

np.reshape(a, (3,-1))       

# the unspecified value is inferred to be 2

# 固定row是3

# -1→系統自動幫判斷column

array([[1, 2],

       [3, 4],

       [5, 6]])

※給新手的便利貼

row 列 

→→→→→→

口口口口口｜

橫→→→→ →

column 欄

↓口直

↓口↓

↓口↓

↓口↓

↓口↓

↓––↓