extracting unique numbers from a cell array

Hi, I am trying to extract the unique values from a cell array whose entries are vectors of unspecified length.

To be more precise I have a 10x10x10 cell arrray, call it G and each cell is empty or contians a vector of some unspecfied length. What I would like to do is obtain the unique list of entries of the vectors that have at least length 2.

For example if

G{1} = [1]

G{2} = [1]

G{3} = [2,3,4]

G{4} = [4,5]

and all the other cells are empty then the output would be [2,3,4,5].

What I have so far is

G = grid(U,d,k); %Grid is a built in function that returns a 10x10x10 cell array
H = find(~cellfun('isempty', G));
h = length(H);
counter = zeros(1,h);
for i = 1:h %find all the cells in G that contian at least two values
    if length(G{H(i)}) >=2
        counter(1,i) = H(i);
    end
end

newcounter = nonzeros(counter); %all array positions in array that have vectors of at least length two

GG = G(newcounter); % collection of cells in G whose vectors are at least two

I'm trying to find a function or an efficent way do this. I have tried concatenating GG and apply unique also I have seem the follwoing suggestion which is to try unique(cellfun(@num2str,G,'uni',0)). This to also fails since I just get GG with all the duplicated cells removed.

Answer 1

[Star Strider]

One approach —

G{1} = [1];
G{2} = [1];
G{3} = [2,3,4];
G{4} = [4,5];

Len2 = cellfun(@(x)numel(x)>=2, G)

Len2 = 1×4 logical array
   0   0   1   1

Gu = unique([G{Len2}])

Gu = 1×4

2 3 4 5

I am not certain how robust this will be to your larger cell array. It works in the provided example.

.

[Milos]

Thansk this works great! I have yet to test anything with larger values

[Star Strider]

As always, my pleasure!