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Remove contradictory SEIRHD observable defaults #341

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Merged
ChrisRackauckas merged 1 commit into from
Sep 12, 2026
Merged

Remove contradictory SEIRHD observable defaults #341

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8 changes: 7 additions & 1 deletion docs/src/examples/SEIRHD.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,12 @@ First, let's implement the classic SEIRHD epidemic model with ModelingToolkit:

```@example seirhd
using DifferentialEquations, Distributions, EasyModelAnalysis, ModelingToolkit, Plots
using SciMLBase: successful_retcode
@independent_variables t
Dₜ = Differential(t)
@variables S(t)=0.9 E(t)=0.05 I(t)=0.01 R(t)=0.2 H(t)=0.1 D(t)=0.01
@variables T(t)=0.0 η(t)=0.0 cumulative_I(t)=0.0
@variables T(t) η(t)
@variables cumulative_I(t)=0.0
@parameters β₁=0.6 β₂=0.143 β₃=0.055 α=0.003 γ₁=0.007 γ₂=0.011 δ=0.1 μ=0.14
eqs = [T ~ S + E + I + R + H + D
η ~ (β₁ * E + β₂ * I + β₃ * H) / T
Expand All @@ -22,6 +24,10 @@ eqs = [T ~ S + E + I + R + H + D
seirhd = structural_simplify(seirhd)
prob = ODEProblem(seirhd, [], (0, 110.0))
sol = solve(prob)
@assert successful_retcode(sol)
@assert [sol[state][1] for state in [S, E, I, R, H, D, cumulative_I]] ==
[0.9, 0.05, 0.01, 0.2, 0.1, 0.01, 0.0]
@assert all(isfinite, Array(sol))
plot(sol)
```

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