Python Error ValueError could not broadcast input array from shape 4 into shape 1000

0 votes

I have the following python code:

big_array = np.zeros(shape=(100,100), dtype=np.uint8) 
mini_square = np.ones(shape=(2,2), dtype=np.uint8) 

flattened_array = np.ravel(big_array) 
flattened_minisquare = np.ravel(mini_square) 

flattened_array[1:-1:10] = flattened_minisquare

I get the following error:

"ValueError: could not broadcast input array from shape (4) into shape (1000)"
Jun 14, 2019 in Python by Gita
30,076 views
What exactly are you trying to do?
I'm trying to insert a small array into a larger one without resizing.

1 answer to this question.

0 votes

There are better ways of achieving the same. Have a look at this:

import numpy as np

big_array = np.zeros(shape=(100,100), dtype=np.uint8)
mini_square = np.ones(shape=(2,2), dtype=np.uint8) 

flattened_array = np.ravel(big_array)
flattened_minisquare = np.ravel(mini_square)

stepsize = 10
temp = np.zeros(stepsize + len(flattened_minisquare) - 1)
temp[-len(flattened_minisquare):] = flattened_minisquare

mask = np.copy(temp)
mask[-len(flattened_minisquare):] = np.ones_like(flattened_minisquare)
mask = ~mask.astype(bool)

out = np.resize(temp, len(flattened_array))
final_mask = np.resize(mask, len(flattened_array))
out[final_mask] = flattened_array[final_mask]

print(out)
#[0. 0. 0. ... 0. 0. 0.]


Hope this helps!

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Thanks!

answered Jun 14, 2019 by Faiza

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