Form a big 2d array from multiple smaller 2d arrays

Question

The question is the inverse of this question. I\'m looking for a generic method to from the original big array from small arrays:

array([[[ 0,  1,  2],
             


        

Answer 1

Here is a solution that one can use if someone is wishing to create tiles of a matrix:

from itertools import product
import numpy as np
def tiles(arr, nrows, ncols):
    """
    If arr is a 2D array, the returned list contains nrowsXncols numpy arrays
    with each array preserving the "physical" layout of arr.

    When the array shape (rows, cols) are not divisible by (nrows, ncols) then
    some of the array dimensions can change according to numpy.array_split.

    """
    rows, cols = arr.shape
    col_arr = np.array_split(range(cols), ncols)
    row_arr = np.array_split(range(rows), nrows)
    return [arr[r[0]: r[-1]+1, c[0]: c[-1]+1]
                     for r, c in product(row_arr, col_arr)]