function Cont=Contingency(Mem1,Mem2)

if nargin < 2 | min(size(Mem1)) > 1 | min(size(Mem2)) > 1
   error('Contingency: Requires two vector arguments')
   return
end

Cont=zeros(max(Mem1),max(Mem2));

for i = 1:length(Mem1);
   Cont(Mem1(i),Mem2(i))=Cont(Mem1(i),Mem2(i))+1;
end