Improved Eulers method help

Hello,

I am beginner at matlab and i want to do myself eulers methods but it's stopped at this one. Cause i want data in a row. In first Eulers method results are correct and everything shows like it should. Can somebody correct me cause i cannot find solution to it?

First Eulers method program is this:

h=0.1; x=0:h:0.5; y=1; n=5; for i=1:n

    f =(x(i)).^3-(5*(x(i)).^2)+7;
    y(i+1)=y(i)+h*f
end
disp(y(i))

And this is where i can't get all data in row and correct the first result.

h=0.1;

x=0:h:0.5;

y=1;

n=1;

for i=0:1:n

    for i=0:1:n

        j=((i+(i+1))/2);

    end

     f =(x).^3-(5*(x).^2)+7;

     y=y+(h*f);

end

disp(y(i))

It shows me just the result of y(n)..

Thank you for help in advance.

Answer 1

[Image Analyst]

If you want to store the y from every iteration, do this:

y(i) = y(i-1) + (h*f);

Instead of having

disp(y(i))

just put y

y

[androSLO]

Yes i have figured it out 2 hours later when i posted question.

Here it is working now:

h=0.1; x=0:h:0.5; y=1; n=1:1:6; for i=1:length(n)-1;

        for ii=1:(length(n)-1)/2;

         f(ii) =(x(ii)).^3-(5*(x(ii)).^2)+7;

        y(i+1)=y(i)+h*f(ii);
    end
    end
    disp(y)

[Image Analyst]

It's recommended not to use i (the imaginary variable) as a loop index.

Also, to format your code, you can see how to do it here: http://www.mathworks.com/matlabcentral/answers/13205#answer_18099