List<String> f = getFunctionVector(equation);
Solution solution = rungeKuttaSolverServiceImpl.solve(equation, step, start, start + 2 * step);
solution.setMax(stop);
if (solution.getResults().size() < 3)
throw new IncorrectODEEquationException("Error : Not enough initial values to solve equation");
List<Double> yn_2 = new ArrayList<Double>();
yn_2.add(solution.getResult(0));
List<Double> yn_1 = new ArrayList<Double>();