Need help with Euler's method differential equations

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Thomas Stolpe 2018-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/418783-need-help-with-euler-s-method-differential-equations

评论： Torsten 2018-9-13

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This is for academic purposes My differential equation is y' = 0.2 -3y

The prompt is in the attached image

I am not sure if I am doing this correctly or not. My professor does not help us with matlab at all (It is a math and matlab course combined, he just teaches us math and expects us to know matlab), is volunteering as the professor, does not reply to my emails, has no office hours, and barely speaks english :(

Here is my attempt:

function [] = WS3_Last_First ()

% y' = 0.2 - 3y

y0 = 1;

tEnd = 5;

h = 0.1;

N = (tEnd-t0)/h;

Y = zeros(N+1,1);

Y(1) = y0;

    for i = 1:N
    fi = 0.2 - 3 * Y(i);
    Y(i+1) = Y(i) + h*fi;
    end

end

plot(T,Y);

end

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Torsten 2018-9-13

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You don't define t0.
You will have to deduce h from N, not vice versa.
What is A in the exercise ? This variable (maybe y0 in your notation) should appear somewhere in your code.
The function should return Y (which you should rename in ySol).

Best wishes

Torsten.

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