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Diffstat (limited to 'chaos/src/lorenz.hpp')
| -rw-r--r-- | chaos/src/lorenz.hpp | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/chaos/src/lorenz.hpp b/chaos/src/lorenz.hpp new file mode 100644 index 0000000..70dad4d --- /dev/null +++ b/chaos/src/lorenz.hpp @@ -0,0 +1,150 @@ +// +// +// chaos~ +// Copyright (C) 2004 Tim Blechmann +// +// This program is free software; you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation; either version 2 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program; see the file COPYING. If not, write to +// the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +// Boston, MA 02111-1307, USA. + +#include "ode_base.hpp" + +// lorenz model: dx1/dt = sigma * (x2 - x1) +// dx2/dt = - x1 * x3 + r * x1 - x2 +// dx3/dt = x1 * x2 - b * x3 +// taken from Willi-Hans Steeb: Chaos and Fractals + +class lorenz + : protected ode_base +{ +public: + logistic() + : m_sigma(16), m_b(4), m_r(40) + { + m_num_eq = 3; + m_data = new data_t[3]; + set_x1(0.8f); + set_x2(0.8f); + set_x3(0.8f); + set_method(0); + } + + ~logistic() + { + delete m_data; + } + + virtual void m_system(data_t* deriv, data_t* data) + { + data_t x1 = data[0], x2 = data[1], x3 = data[2]; + + deriv[0] = m_sigma * (x2 - x1); + deriv[1] = - x1 * x3 + m_r * x1 - x2; + deriv[3] = x1 * x2 - m_b * x3; + } + + void set_x1(t_float f) + { + m_data[0] = (data_t) f; + } + + t_float get_x1() + { + return (t_float)m_data[0]; + } + + void set_x2(t_float f) + { + m_data[1] = (data_t) f; + } + + t_float get_x2() + { + return (t_float)m_data[1]; + } + + void set_x3(t_float f) + { + m_data[2] = (data_t) f; + } + + t_float get_x3() + { + return (t_float)m_data[2]; + } + + + void set_sigma(t_float f) + { + if (f > 0) + m_sigma = (data_t) f; + else + post("value for sigma %f out of range", f); + } + + t_float get_sigma() + { + return (t_float)m_sigma; + } + + + void set_r(t_float f) + { + if (f > 0) + m_r = (data_t) f; + else + post("value for r %f out of range", f); + } + + t_float get_r() + { + return (t_float)m_r; + } + + void set_b(t_float f) + { + if (f > 0) + m_b = (data_t) f; + else + post("value for b %f out of range", f); + } + + t_float get_b() + { + return (t_float)m_b; + } + + +private: + data_t m_sigma, m_r, m_b; +}; + + +#define LORENZ_CALLBACKS \ +ODE_CALLBACKS; \ +FLEXT_CALLVAR_F(m_system->get_sigma, m_system->set_sigma); \ +FLEXT_CALLVAR_F(m_system->get_r, m_system->set_r); \ +FLEXT_CALLVAR_F(m_system->get_b, m_system->set_b); \ +FLEXT_CALLVAR_F(m_system->get_x1, m_system->set_x1); \ +FLEXT_CALLVAR_F(m_system->get_x2, m_system->set_x2); \ +FLEXT_CALLVAR_F(m_system->get_x3, m_system->set_x3); + +#define LORENZ_ATTRIBUTES \ +ODE_ATTRIBUTES; \ +FLEXT_ADDATTR_VAR("sigma",m_system->get_sigma, m_system->set_sigma); \ +FLEXT_ADDATTR_VAR("r",m_system->get_r, m_system->set_r); \ +FLEXT_ADDATTR_VAR("b",m_system->get_g, m_system->set_g); \ +FLEXT_ADDATTR_VAR("x1",m_system->get_x1, m_system->set_x1); \ +FLEXT_ADDATTR_VAR("x2",m_system->get_x2, m_system->set_x2); \ +FLEXT_ADDATTR_VAR("x3",m_system->get_x3, m_system->set_x3); |