choose elements from array

Hi My question is how to pick up elements from data. if each element can be chosen or not, it will be 2^n. suppose we have 3 elements ,2^3 types can be picked . n element in 2^n.what's the command of this format?

[Geoff Hayes]

Soosan - please provide a simple example of what you expect. If n is three, what are the 8 types?

[adele]

n=1 2 3 combination: 0

1

2

3

1,2

1,3

2,3

1,2,3

Answer 1

[Thorsten]

To compute a cellarray 'combinations' with all 2^N possible combinations of elements, you can use:

 val = 1:3;

 N = numel(val);
 binind = dec2bin( [0 1:2^N - 1]);
 for i = 1:2^N
   combinations{i} = val(logical(binind(i,:) - '0'));
 end