The Pendulum Differential Equation

**PENDULUM_ODE**,
a MATLAB library which
looks at some simple topics involving the linear and nonlinear
ordinary differential equations (ODEs) that represent the behavior
of a pendulum of length L under a gravitational force of strength G.

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

**PENDULUM_ODE** is available in
a MATLAB version.

FLAME_ODE, a MATLAB library which considers an ordinary differential equation (ODE) which models the growth of a ball of flame in a combustion process.

LORENZ_ODE, a MATLAB program which approximates solutions to the Lorenz system, creating output files that can be displayed by gnuplot.

PREDATOR_PREY_ODE, a MATLAB program which solves a pair of predator prey ordinary differential equations (ODE's) using MATLAB's ode23() solver.

SPRING_ODE, a MATLAB program which shows how line printer graphics can be used to make a crude illustration of a solution of the ordinary differential equation (ODE) that describes the motion of a weight attached to a spring.

TEST_ODE, a MATLAB library which defines ordinary differential equations (ODE) test problems.

- pendulum_linear.m, linear pendulum right hand side suitable for MATLAB ODE solvers.
- pendulum_nonlinear.m, nonlinear pendulum right hand side suitable for MATLAB ODE solvers.
- timestamp.m, prints the YMDHMS date as a timestamp.