MATLAB: Enumerating All Combinations of Items in An Arbitrary Number of Sets [duplicate]

Answer 1

Try allcomb from the MATLAB file exchange

allcomb

Answer 2

Here is a quick function which will work if the inputs are a cell array.

function comb=allcomb(ip)

ncells=length(ip);
[nd{1:ncells}]=ndgrid(ip{:});
catted=cat(ncells,nd{1:ncells});
comb=reshape(catted,length(catted(:))/ncells,ncells);