# Add items to the list keeping the multidimensionality browsing

• posted
0

Hi to all, In the code below I take a picture and convert it into a 3d array numpy (cordinates x, y of each pixel and color rgb) Then skim this array and sequentially extract of the matrices 5 x 5 x 3 (then arrays of 5 x 5 px most the rgb values 3) and insert them in an array

``````from PIL import Image
import numpy as np

img = Image.open("img.jpg")
arr = np.array(img)

x = []
h,w,rgb = arr.shape
size = 5

for i in range(0,h):
for j in range(0,w):
part = arr[i:i+size,j:j+size]
if len(part)==size and len(part[0])==size:
x.append(part)

``````

The result is something like:

``````...
[[129, 166, 175],
[129, 166, 175],
[130, 167, 175],
[128, 166, 175],
[128, 166, 175]],

...

[[129, 166, 174],
[129, 166, 174],
[129, 166, 175],
[129, 166, 175],
[128, 166, 175]]], dtype=uint8), 129, 166, 175, array([[[129, 166, 175],
[128, 166, 175],
[128, 166, 175],
[128, 166, 175],
[128, 168, 176]],

...

[[129, 166, 174],
[129, 166, 175],
[129, 166, 175],
[128, 166, 175],
[129, 167, 176]]], dtype=uint8), 129, 166, 175, array([[[128, 166, 175],
[128, 166, 175],
[128, 166, 175],
[128, 168, 176],
[128, 168, 178]],

...

[[129, 166, 175],
[129, 166, 175],
[128, 166, 175],
[129, 167, 176],
[128, 168, 176]]], dtype=uint8), 128, 166, 175]
``````

While I would expect something like

``````...
[[129, 166, 175],
[129, 166, 175],
[130, 167, 175],
[128, 166, 175],
[128, 166, 175]],

...

[[129, 166, 174],
[129, 166, 174],
[129, 166, 175],
[129, 166, 175],
[128, 166, 175]]], dtype=uint8), array([[[129, 166, 175],
[128, 166, 175],
[128, 166, 175],
[128, 166, 175],
[128, 168, 176]],

...

[[129, 166, 174],
[129, 166, 175],
[129, 166, 175],
[128, 166, 175],
[129, 167, 176]]], dtype=uint8), array([[[128, 166, 175],
[128, 166, 175],
[128, 166, 175],
[128, 168, 176],
[128, 168, 178]],

...

[[129, 166, 175],
[129, 166, 175],
[128, 166, 175],
[129, 167, 176],
[128, 168, 176]]], dtype=uint8)]
``````

So a matrix that is always 5 x 5 x 3 not in some one-dimensional points after the fact ", dtype=uint8)," I would expect a, array([[[128, 166, 175], and not a 128, 166, 175
thank you.

• posted
0

@iacoposk8 This would be a good use of pdb, since you could look at what you are appending each cycle in the loop. Or, just print out something in each loop such as part.shape. I wonder if this isn't just a display issue (things getting overwritten or omitted?)... have you actually checked the type/sizes of the elements in x?

Internal error.

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