// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) ????-2008 - INRIA
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution.  The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt


function [X,rk,Ac]=rowcompr(A)
    //[X,rk,Ac]=rowcompr(A)
    //row compression of polynomial matrix A (toward the bottom)
    //X left polynomial unimodular base
    //rk=normal rank of A
    //Ac = X*A
    //Warning: elimination of neglected terms
    //!
    [n,m]=size(A);
    [Ac,U,rk]=htrianr(A');
    Ac=Ac';
    X=U';
    X=X(n:-1:1,:)
    Ac=Ac(n:-1:1,:)
endfunction