function [Y] = CollectOddEvenRows( X, oddFlg )
% Return the matrix transformed so that the rows are grouped as
% .. all even-numbered rows, and all odd-numbered rows.
% oddFlg:   0 => even-numbered rows are on top
%           1 =>  odd-numbered rows are on top
%
% 14 Jan 2009 - D.Bozarth
%
Y = [];
h = size(X, 1);

for k = 1:h
   if xor( oddFlg, (k/2 == floor(k/2)) ) 
      Y = [Y ; X(k,:)];
   end
end
for k = 1:h
   if ~xor( oddFlg, (k/2 == floor(k/2)) )
      Y = [Y ; X(k,:)];
   end
end
%
% end script