Question

I have a question, as I perform mathematical operations with an array of lists such as I get the sum of each array list getting a new list with the Valar for the sum of each list in the array.

thanks for any response

Answer 1

What I understand is that you have a list of list — in effect, matrix. You want the sum of each row. I agree with other answerers that you should use numpy.

we can create a mulidimensional array:

>>> import numpy
>>> a = numpy.array([[1,2,3], [4,5,6], [7,8,9]])
>>> a
array([[1, 2, 3],
       [4, 5, 6],
       [7, 8, 9]])

Now we can use a.sum([dimension]) where dimension is how you want to sum the array. Summing each row is dimension 1:

>>> a.sum(1)
array([ 6, 15, 24])

You can also sum each column:

>>> a.sum(0)
array([12, 15, 18])

And sum all:

>>> a.sum()
45