Convert a list to an array

Questions / Help
1

Hi guys, I have a doubt. How can I convert a list to a 100x100 matrix?
I have the following code where I extract a text of floating numbers in a list:

def parseA() do
{:ok, contents} = File.read(“MatrizA.txt”)
contents |> String.split(“\t”, trim: true) |> Enum.map(fn n → {v, _} = Float.parse(n); v end)
end

but now I want to transform that list into a matrix. How can I do it? if you can help me!

2

You may have to be a little more specific.

Do you just want each consecutive group of 100 elements to be a new column?

Or are there other criteria for splitting up the initial list.

An example of the data and your desired output would be helpful.

3

If it’s the first case, Enum.chunk_every/4 is probably what you want, https://hexdocs.pm/elixir/Enum.html#chunk_every/4

1 Like
4

Thanks, This was what i meant

5

If you did want to do custom “chunking”, you could use Enum.chunk_by and provide your own function to do the “chunking”