private static void prepareCSVData()
    {
        FileManager fileManager = new FileManager();
        fileManager.delete(Program.FILE_TO_SAVE);

        fileManager.save(Program.getHeader(), Program.FILE_TO_SAVE);

        for (double number : numbers) {
            double in_build_function = Math.cos(number) * Math.atan(number);

            double a = measure.calculateFromBeginning(number);
            double b = measure.calculateFromEnd(number);
            double c = measure.calculateBasedOnPreviousElementFromBeginning(number);
           // double d = measure.calculateBasedOnPreviousElementFromEnd(number);

           double error_1 =  Helpers.diffAbsolute(in_build_function, a);
           double error_2 = Helpers.diffAbsolute(in_build_function, b);

            fileManager.save(
                Program.getCSVString(
                    number,
                    in_build_function,
                    a,
                    b,
                    c,
                   // d,
                    error_1,
                    error_2,
                    Helpers.diffAbsolute(in_build_function, c),
                    0.0

                ),
                Program.FILE_TO_SAVE
           );
        }
    }

    private static String getHeader()
    {
        return "" +
                "Argument;" +
                "Funkcja wbudowana;" +
                "Od poczatku z wzoru;" +
                "Od konca z wzoru;" +
                "Poprzedni od poczatku;" +
                //"Poprzedni od konca;"
                "Blad od poczatku z wzoru;" +
                "Blad od konca z wzoru;" +
                "Blad poprzedni od poczatku;" +
                "Blad poprzedni od konca\n";
    }

    private static String getCSVString(
            double i,
            double build_in_function,
            double calculate_from_beginning,
            double calculate_from_end,
            double onPreviousElementFromBeginning,
           /* double onPreviousElementFromEnd,*/
            double errorFromBeginning,
            double errorFromEnd,
            double errorOnPreviousFromBeginning,
            double errorOnPreviousFromEnd
    ) {
        return String.format(
                "%.10f;%.17f;%.17f;%.17f;%.17f;%.17f;%.17f;%.17f;%.17f;\n", //%.17f\n",
                i,
                build_in_function,
                calculate_from_beginning,
                calculate_from_end,
                onPreviousElementFromBeginning,
                //onPreviousElementFromEnd,
                errorFromBeginning,
                errorFromEnd,
                errorOnPreviousFromBeginning,
                errorOnPreviousFromEnd
        );
    }
}