**rk4_test**,
a MATLAB program which
calls rk4() for a simple Runge-Kutta solver for an initial value problem.

rk4, a MATLAB library which applies the fourth order Runge-Kutta (RK) algorithm to estimate the solution of an ordinary differential equation (ODE) at the next time step.

- rk4_test.m, calls all the tests.
- rk4_test.sh, runs all the tests.
- rk4_test.txt, the output file.

- rk4_step_test.m, tests rk4_step on a scalar ODE.
- rk4_step_test_f.m, a function which evaluates the right hand side.
- rk4vec_step_test.m, tests rk4vec_step on a vector ODE.
- rk4vec_step_test_f.m, a function which evaluates the right hand side.