Split and merge array numpy

merge

 

 

 

 np.newaxis

import numpy as np
A = np.array ([l, 2,3 ] ) [:, np.newaxis] # into the column vector 
B = np.array ([4,5,6 ] ) [:, np.newaxis] # into column vector 
C = np.vstack ((A, B)) # Vertical Stack 
D = np.hstack ((A, B)) # Horizontal Stack 
Print (a.shape, b.shape)    # ((3,1), (3, 1)) 
Print (c.shape)     # (6, 1) 
Print (d.shape)     # (3,2)

 

np.concatenate

import numpy as np
a=np.array([1,2,3])[:,np.newaxis]
b=np.array([4,5,6])[:,np.newaxis]
C = np.concatenate ((A, B, B, A))
 Print (C) # by columns into 
D = np.concatenate ((A, B, B, A), Axis = 0) # arranged in the column were combined 
Print (D)
E = np.concatenate ((A, B, B, A), Axis =. 1) # provided combined in a row, three rows and four columns 
Print (E)

 

Split

 

 

import numpy as np

A = np.arange (12 is) .reshape ((3,4- ))
 Print (A)
 Print (np.split (A, 2, Axis =. 1)) #    Vertical partial longitudinal section 2 
Print (np.split (A, 3, Axis = 0)) #    Horizontal lateral three parts 
Print (np.array_split (A, 3, Axis =. 1)) # longitudinal 3 portions

Print (np.vsplit (A, 3)) # transversely divided into three groups 
Print (np.hsplit (A, 2)) # vertically divided into two groups