how to move specific part of a 2d array to either left right up or down?

I know that you can move an array with NumPy so if you use np.roll you can shift array to right or to the left. I was wondering how to move a specific set of values with in the array to either left right up or down.

for example

if I wanted to move what is circled in red to the left how would i be able to move that and nothing else?

Answer

numpy can use slice to get subarray and later assing it in different place

import numpy as np

x = [
  [0, 1, 2, 1, 0, 0, 1, 2, 1, 0 ],
  [0, 1, 2, 1, 0, 0, 1, 2, 1, 0 ]
]

arr = np.array(x)

print(arr)

subarr = arr[0:2,1:4]  # get values
print(subarr)

arr[0:2,0:3] = subarr  # put in new place

print(arr)

Result:

[[0 1 2 1 0 0 1 2 1 0]
 [0 1 2 1 0 0 1 2 1 0]]

[[1 2 1]
 [1 2 1]]

[[1 2 1 1 0 0 1 2 1 0]
 [1 2 1 1 0 0 1 2 1 0]]

It keeps original values in [0][1], [1][1]. If you want remove them then you could copy subarray, set zero in original place, and put copy in new place

import numpy as np

x = [
  [0, 1, 2, 1, 0, 0, 1, 2, 1, 0 ],
  [0, 1, 2, 1, 0, 0, 1, 2, 1, 0 ]
]

arr = np.array(x)

print(arr)

subarr = arr[0:2,1:4].copy()  # duplicate values
print(subarr)

arr[0:2,1:4] = 0  # remove original values

arr[0:2,0:3] = subarr  # put in new place

print(arr)

Result

[[0 1 2 1 0 0 1 2 1 0]
 [0 1 2 1 0 0 1 2 1 0]]

[[1 2 1]
 [1 2 1]]

[[1 2 1 0 0 0 1 2 1 0]
 [1 2 1 0 0 0 1 2 1 0]]