MathLab Gamocda N1

f = [];
i = 1;
dlmwrite('data3.txt', f, '\t');
for x=-4:0.1:4

    if (x >= 2)
       y = 3*x^2+7;
    else
        if (x > -2)
           y = tan(x^2);
        else
            y = (x+3)/(x^2+5);
        end
    end

    f(i) = y;
    dlmwrite('data3.txt', f(i), '-append');
    i = i + 1;
end
dlmread('data3.txt', '\n');

dlmwrite('dataMy.txt', rand(3), '-append');