Inputs
Result
Predictor (Euler)
ỹₙ₊₁ = yₙ + h·f(xₙ,yₙ)
Corrector (Heun)
yₙ₊₁ = yₙ + (h/2)[f(xₙ,yₙ)+f(xₙ₊₁,ỹₙ₊₁)]
Heun Approx y(x_end)
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Error vs Exact
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2nd-order predictor-corrector: ỹₙ₊₁ = yₙ + h·f(xₙ,yₙ) (predict), then yₙ₊₁ = yₙ + (h/2)[f(xₙ,yₙ) + f(xₙ₊₁,ỹₙ₊₁)] (correct with average slope).
Configure inputs above.