From a given vector create all combinations possible

Hello,

from a given vector i want to create all possible combinations.

I have the following code, a vector of [5 10 15] and I want to create the combinations of maxHiddenLayers numbers, it it has the value 2 i would get for example:

[5 5; 5 10; 5 15; 10 5; 10 10; 10 15; 15 5; 15 10; 15 15]

With the code i got i am not geting the [5 5; 10 10; 15 15], i can't have the same number in the columns and i wanted.

maxHiddenLayers = 2;
minNeurons = 5;
maxNeurons = 15;
rangeNeurons = minNeurons:5:maxNeurons;
nk = nchoosek(rangeNeurons,maxHiddenLayers)
p = zeros(0,maxHiddenLayers);
for i=1:size(nk,1),
    pi = perms(nk(i,:));
    p = unique([p; pi],'rows')
end

Answer 1

[Stephen23]

>> V = [5,10,15];
>> [X,Y] = ndgrid(V);
>> M = [Y(:),X(:)]
M =
    5    5
    5   10
    5   15
   10    5
   10   10
   10   15
   15    5
   15   10
   15   15

[Tiago Dias]

Thanks.

It is possible to compute the M depending on the number of the variable maxHiddenLayers ? if i want 2 the outcome has 3 column, and if i want 3 the output has 3 columns?

[Stephen23]

>> N = 3; % number of columns
>> V = [5,10,15];
>> C = cell(1,N);
>> [C{:}] = ndgrid(V);
>> C = cellfun(@(v)v(:),C,'uni',0);
>> M = [C{end:-1:1}]
M =
    5    5    5
    5    5   10
    5    5   15
    5   10    5
    5   10   10
    5   10   15
    5   15    5
    5   15   10
    5   15   15
   10    5    5
   10    5   10
   10    5   15
   10   10    5
   10   10   10
   10   10   15
   10   15    5
   10   15   10
   10   15   15
   15    5    5
   15    5   10
   15    5   15
   15   10    5
   15   10   10
   15   10   15
   15   15    5
   15   15   10
   15   15   15

https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html

https://www.mathworks.com/matlabcentral/answers/320713-how-to-operate-on-comma-separated-lists

[Walter Roberson]

[combo_cell{1:maxHiddenLayers}] = ndgrid(V);
temp_cell = cellfun(@(M) M(:), combo_cell, 'uniform', 0);
M = horzcat(temp_cell{:});

[Tiago Dias]

Thanks for your input it is also corrected. like Stephen answer. I will accpect his answer because he was first. but your answer works as well! Thanks