function [ A ] = swapRows( A,u,v )
%swapRows: swap rows u and v of matrix A and send the answer as output
  storeMe = A( v, : );     % store row v of A
  A( v , : ) = A( u, : );  % copy row u of A into row v of A
  A( u , : ) = storeMe;    % copy the stored row into row u of A
end