Find if 2D array is an exact subarray of another 2D array?

Question

I'm stuck with the problem of testing whether or not a 2d array appears in the exact same order in another 2d array, e.g.:

01
23

in

would return true, but in

would return false.

I've already attempted to use scipy.signal.correlate2d but to no avail. Any help? Cheers!

)edit) Code for generating the data:

import numpy as np
a = np.array([[0,0,0,1,0,0],
             [0,0,2,3,0,0],
             [0,0,0,0,0,0],
             [0,0,0,0,0,0]])

a = np.array([[0,0,1,0,0,0],
             [0,0,2,3,0,0],
             [0,0,0,0,0,0],
             [0,0,0,0,0,0]])



b = np.array([[0,1],
             [2,3]])

can you add the array constructors to your question? and the exact command you tried — mozway
– mozway, Commented Mar 15, 2022 at 9:14

mozway · Accepted Answer · 2022-03-15 10:03:37Z

2

from skimage.util import view_as_windows

windows = view_as_windows(a, b.shape)

print((windows == b).all(axis=(2,3)).any())

would be the answer, as stated in How can I check if one two-dimensional NumPy array contains a specific pattern of values inside it?

edited Mar 15, 2022 at 10:03

mozway

267k13 gold badges56 silver badges106 bronze badges

answered Mar 15, 2022 at 10:01

axequesty2

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