how to sum in 2d python array, without Numpyt

Question

Lets say I have the following array:

My_Array = [[1,2,3],[4,5,6],[7,8,9]]

I want to sum each of these arrays so the output would be

My_Array = [[6],[15],[24]]

How can I do this without using Numpy?

mhhabib · Accepted Answer · 2020-12-13 18:24:27Z

2

Python provide an inbuilt function sum() which sums up the numbers in the list.

My_Array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print([sum(x) for x in My_Array])

If you want to get sum value also as a list then

[[sum(x)] for x in My_Array]

answered Dec 13, 2020 at 18:24

mhhabib

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Comments

sheldonzy · Accepted Answer · 2020-12-13 18:25:45Z

0

A simple solution would be:

[[sum(i)] for i in My_Array]

I recommend taking a look at Python's naming convention. My_Array isn't quite pythonic.

answered Dec 13, 2020 at 18:25

sheldonzy

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devShaurya · Accepted Answer · 2020-12-13 18:26:08Z

0

You could use for loop to go over array and sum each array individually and then store it again inside the array.

for i in range(len(My_Array)):
    My_Array[i]=[sum(My_Array[i])]

answered Dec 13, 2020 at 18:26

devShaurya

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