**bdf2_test**,
a Fortran90 code which
calls bdf2(), which
solves one or more ordinary differential equations (ODE)
using the (implicit) backward difference formula order 2 (BDF2) method,
with a version of fsolve() handling the associated nonlinear equation,
and using a fixed time step.

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

bdf2, a Fortran90 code which solves one or more ordinary differential equations (ODE) using the (implicit) backward difference formula order 2 (BDF2) method, with a version of fsolve() handling the associated nonlinear equation, and using a fixed time step.

- bdf2_test.f90, calls all the tests.
- bdf2_test.sh, runs all the tests.
- bdf2_test.txt, the output file.

- predator_prey.png, a plot of the solution.
- stiff.png, a plot of the solution.