Ubuntu on Laptop external monitor not working properly

Question

How does one loop through sub arrays of a parent array but iterate over one index per sub array.

I know the solution I want involves at least iterating over a 2D array but I currently know how to print all elements of sub arrays in a parent array

For example say I have const array = [[1, 2, 3], ['a', 'b', 'c'], ['@', '#', '%']];

How do I get const result = [[1, 'a', '@'], [2, 'b', '#'], [3, 'c', '%']; ?

Solution

I found out, that on my system two X display managers where installed: gdm and lightdm. The default one was lightdm. After setting the one to gdm I can now use both monitors without any problem!

To change the default simply run sudo dpkg-reconfigure lightdm.

I hope this helps if someone has the same problem!

Comments

[T Tse]

This operation is called Convolution, and to search for the right answer you should search for "javascript zip array", which would bring you to this question.

[adiga]

array[0].map((_, i) => array.map(row => row[i]))

[Okezie Frank Obiedere]

Wow! thanks, sorry for asking a duplicate question, I did not know there was an actual word for what I was describing ie transposing sub arrays in an array. I think I have enough clues and answers to play with and understand. Thanks again everyone

[sprabhakaran]

unix.stackexchange.com/questions/131496/what-is-lightdm-and-‌​gdm

[adiga]

This only works for square matrix (2D array with same number of rows and columns). It won't work for [[1, 2, 3], ['a', 'b', 'c']]

[Alen.Toma]

Well is it not what he needs? he marked it as an answer so.