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function out = CombVec(varargin)
%CombVec Generate all possible combinations of input vectors.
%
% CombVec(A1,A2,...) takes any number of inputs,
% A1 - Matrix of N1 (column) vectors.
% A2 - Matrix of N2 (column) vectors.
% ...
% and returns a matrix of (N1*N2*...) column vectors, where the columns
% consist of all possibilities of A2 vectors, appended to
% A1 vectors, etc.
%
% Example
%
% a1 = [1 2];
% a2 = [3 4; 3 4];
% a3 = CombVec(a1,a2)
% a3 =
% 1 2 1 2
% 3 3 4 4
% 3 3 4 4
% 2008-08-06 DN Wrote it, modification of CombVec in Matlab's Neural
% Network Toolbox
if isempty(varargin)
out = [];
else
out = varargin{1};
for i=2:length(varargin)
cur = varargin{i};
out = [copyb(out,size(cur,2)); copyi(cur,size(out,2))];
end
end
%=========================================================
function b = copyb(mat,s)
[mr,mc] = size(mat);
inds = 1:mc;
inds = inds(ones(s,1),:).';
b = mat(:,inds(:));
%=========================================================
function b = copyi(mat,s)
[mr,mc] = size(mat);
inds = 1:mc;
inds = inds(ones(s,1),:);
b = mat(:,inds(:));
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