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How to find increment function using Heun's method?

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Yusuke Nakamura
Yusuke Nakamura 2015-4-26
评论： Jan 2015-4-26
Q: For the given differential equation: dy/dt + 2yt = 4, find the increment function using Heun's method without iteration for the step from t=2 to t=4 if y(2)=3.
My code is: dydt = @(t,y) 4-2*y*t; [t,y] = heun(dydt,[2 4],3,1,[],1)
Then I got y = 3, 16, 276
The answer should be 50.00, but I don't know what I can do next to get this value.

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