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From a given vector create all combinations possible

Asked by Tiago Dias on 26 Jul 2019
Latest activity Commented on by Tiago Dias on 26 Jul 2019
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

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1 Answer

Answer by Stephen Cobeldick on 26 Jul 2019
Edited by Stephen Cobeldick on 26 Jul 2019
 Accepted Answer

>> 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

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

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