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-- Copyright (C) 2000-2002 The University of Cincinnati.
-- All rights reserved.
-- This file is part of VESTs (Vhdl tESTs).
-- UC MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
-- SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
-- OR NON-INFRINGEMENT. UC SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
-- LICENSEE AS A RESULT OF USING, RESULT OF USING, MODIFYING OR
-- DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
-- By using or copying this Software, Licensee agrees to abide by the
-- intellectual property laws, and all other applicable laws of the U.S.,
-- and the terms of this license.
-- You may modify, distribute, and use the software contained in this
-- package under the terms of the "GNU GENERAL PUBLIC LICENSE" version 2,
-- June 1991. A copy of this license agreement can be found in the file
-- "COPYING", distributed with this archive.
-- You should have received a copy of the GNU General Public License
-- along with VESTs; if not, write to the Free Software Foundation,
-- Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-- ---------------------------------------------------------------------
--
-- $Id: 2nd_order_ode.ams,v 1.1 2002-03-27 22:11:17 paw Exp $
-- $Revision: 1.1 $
--
-- ---------------------------------------------------------------------
entity VanDerPol is
generic (m: real := 1.0);
end entity VanDerPol;
architecture SecondOrderODE of VanDerPol is
quantity x:real;
begin
-- the break statement sets the initial conditions
break x => 0.0, x'dot => 0.1;
-- second-order Van Der Pol ODE
x'dot'dot == -x -m*(x*x - 1.0)*x'dot;
end architecture SecondOrderODE;
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