MATLAB: Combination of 4 Element

Question

How do i put this to the simple way?

bl is a cell contained one or two elements

a1 = cell2mat(bl(1));

a2 = cell2mat(bl(2));

a3 = cell2mat([bl(1) bl(2)]);

a4 = cell2mat(bl(3));

a5 = cell2mat([bl(1) bl(3)]);

a6 = cell2mat([bl(2) bl(3)]);

a7 = cell2mat([bl(1) bl(2) bl(3)]);

a8 = cell2mat(bl(4));

a9 = cell2mat([bl(1) bl(4)]);

a10 = cell2mat([bl(2) bl(4)]);

a11 = cell2mat([bl(1) bl(2) bl(4)]);

a12 = cell2mat([bl(3) bl(4)]);

a13 = cell2mat([bl(1) bl(3) bl(4)]);

a14 = cell2mat([bl(2) bl(3) bl(4)]);

a15 = cell2mat([bl(1) bl(2) bl(3) bl(4)]);

i tried using

for i=1:4

a{i}=combnk(bl,i);

end

but end up with cell in cell element, and it is hard to access.

thank you.

Answer 1

I make use of my function NCHOOSE, available here:

https://www.mathworks.com/matlabcentral/fileexchange/20011-nchoose

% bl is a cell array with four elements, each cell has 1 or 2 elements.
bl = {1 , [2 3], 4, [5 6]} 
bi = nchoose(1:numel(bl)) 
a = cellfun(@(k) [bl{k}], bi, 'un', 0 )