how can i separate between two arrays inside a parent array

Question

this code is a small example of what i want to do, i have this small example right here:

y=[[[1,0],[0,0],[1,1],[1,0],[1,0],[0,1]],[[1,0],[0,0],[1,1],[0,0]],[[1,0],[0,0],[1,1],[1,0],[1,0],[1,0]]]
array=[]
all_array=[]
for i in 1:length(y)
    for j in 1: length(y[i])
        if y[i][j]==[1,0]
            push!(array,y[i][j])
        end
        
    end
end

what i'm expecting when you return array is this :

[[[1,0],[1,0],[1,0]],[[1,0]],[[1,0],[1,0],[1,0],[1,0]]]

which is 3-element Array{Array{Array{Int64,1},1},1} but instead i get this:

8-element Array{Any,1}:
 [1, 0]
 [1, 0]
 [1, 0]
 [1, 0]
 [1, 0]
 [1, 0]
 [1, 0]
 [1, 0]

i don't know what i'm missing here.

aramirezreyes · Accepted Answer · 2020-08-31 00:34:56Z

1

You are pushing all the elements that satisfy your condition one after another in array. You could create your array instead like:

julia> array=[[],[],[]]

And modify your loop to push! into each subarray array[i] like this:

julia> for i in 1:length(y)
           for j in 1: length(y[i])
               if y[i][j]==[1,0]
                   push!(array[i],y[i][j])
               end

           end
       end

Which then gives you your desired array.

julia> array
3-element Array{Array{Any,1},1}:
 [[1, 0], [1, 0], [1, 0]]
 [[1, 0]]
 [[1, 0], [1, 0], [1, 0], [1, 0]]

answered Aug 31, 2020 at 0:34

aramirezreyes

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