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Tighten the interval returned by InternalITP when there's an exact zero crossing #1137

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merged 3 commits into from
Apr 3, 2025
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Tighten the interval returned by InternalITP when there's an exact zero crossing #1137

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8564f6a
Tighten the callback interval when there's an exact zero crossing
DaniGlez Apr 1, 2025
a270e37
Fix formatting
DaniGlez Apr 1, 2025
8710d95
Integrate #1136
DaniGlez Apr 1, 2025
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9 changes: 2 additions & 7 deletions src/internal_itp.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ function SciMLBase.solve(prob::IntervalNonlinearProblem{IP, Tuple{T, T}}, alg::I
retcode = ReturnCode.ExactSolutionRight, left, right)
end
span = abs(right - left)
k1 = T(alg.scaled_k1)/span
k1 = T(alg.scaled_k1) / span
n0 = T(alg.n0)
n_h = exponent(span / (2 * ϵ))
ϵ_s = ϵ * exp2(n_h + n0)
Expand All @@ -61,11 +61,6 @@ function SciMLBase.solve(prob::IntervalNonlinearProblem{IP, Tuple{T, T}}, alg::I
xt = ifelse(δ ≤ abs(diff), x_f + copysign(δ, diff), mid) # Truncation Step

xp = ifelse(abs(xt - mid) ≤ r, xt, mid - copysign(r, diff)) # Projection Step
if span < 2ϵ
return SciMLBase.build_solution(
prob, alg, xt, f(xt); retcode = ReturnCode.Success, left, right
)
end
yp = f(xp)
yps = yp * sign(fr)
if yps > T0
Expand All @@ -74,7 +69,7 @@ function SciMLBase.solve(prob::IntervalNonlinearProblem{IP, Tuple{T, T}}, alg::I
left, fl = xp, yp
else
return SciMLBase.build_solution(
prob, alg, xp, yps; retcode = ReturnCode.Success, left, right
prob, alg, xp, yps; retcode = ReturnCode.Success, left = xp, right = xp
)
end

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