How to convert 2d nested array into 2d array single?

Question

I have an array a as follow : [[(0,0),(2,0)],[(1,1)], [(3,8)]]

So now I want to convert it like this: [(0,0),(2,0),(1,1), (3,8)]

How may I do that?

I had tried bellow code and successed, but I need some ideas better and faster.

nresult = []
for i in range(len(result)):
    arr = result[i]
    for j in range(len(arr)):
        nresult.append(arr[j])

Can someone help me?

Thanks!

https://stackoverflow.com/questions/952914/how-to-make-a-flat-list-out-of-list-of-lists — Akhilesh_IN, Mar 07 '19 at 08:52

Sreeram TP · Accepted Answer · 2019-03-07T09:01:22.540

1

You can use reduce from functools like this

from functools import reduce

a = [[(0,0),(2,0)],[(1,1)], [(3,8)]]
res = reduce(lambda x,y: x+y,a)

print(res) # [(0, 0), (2, 0), (1, 1), (3, 8)]

edited Mar 07 '19 at 09:01

answered Mar 07 '19 at 08:48

Sreeram TP

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Happy to hear I could help. :) – Sreeram TP Mar 07 '19 at 09:05

score 1 · Answer 2 · answered Mar 07 '19 at 09:00

1

If your nested-deep is certain, you can use chain from itertools package

from itertools import chain

data = [[(0,0),(2,0)],[(1,1)], [(3,8)]]

result = list(chain(*data))

answered Mar 07 '19 at 09:00

Rancho

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score 0 · Answer 3 · answered Mar 07 '19 at 08:53

0

You can use list comprehensions -

nested = [[(0,0),(2,0)],[(1,1)], [(3,8)]]
un_nested = [inside_element for element in nested for inside_element in element]
# Returns - [(0, 0), (2, 0), (1, 1), (3, 8)]

answered Mar 07 '19 at 08:53

Mortz

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How to convert 2d nested array into 2d array single?

3 Answers3

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