Hi everyone, I have a vector of 5 columns, x=[1 2 3 4 5]; i want to create all possible combinations of first element with the other remaining.

Hi everyone, I have a vector of 5 columns, x=[1 2 3 4 5]; i want to create all possible combinations of first element with the other remaining and then all possible combinations of 2nd element with the other 4 and so on all the combinations of the remaining elements with the other remaining in the vector.

Answer 1

[Walter Roberson]

x = 1:5

x = 1×5

1 2 3 4 5

nchoosek(x, 2)

ans = 10×2

1 2 1 3 1 4 1 5 2 3 2 4 2 5 3 4 3 5 4 5

[Maimoona Asad]

i want the combinations to be other than 2 also just like in subsets. how can I?

[Walter Roberson]

x = 1:5;
membership = dec2bin(0 : (2.^length(x)-1)) == '1';
subsets = arrayfun(@(ROWIDX) x(membership(ROWIDX,:)), (1:size(membership,1)).', 'uniform', 0)

subsets = 32×1 cell array
    {1×0 double}
    {[       5]}
    {[       4]}
    {[     4 5]}
    {[       3]}
    {[     3 5]}
    {[     3 4]}
    {[   3 4 5]}
    {[       2]}
    {[     2 5]}
    {[     2 4]}
    {[   2 4 5]}
    {[     2 3]}
    {[   2 3 5]}
    {[   2 3 4]}
    {[ 2 3 4 5]}

[Maimoona Asad]

how can i access indivual element of this array

[Walter Roberson]

subsets{1}
subsets{2}
subsets{3}
%and so on