FA-65625 / Ecological population dynamics / Member archive

Nicholson-Bailey host-parasitoid generations: simultaneous generation update · case 05

Parasitoid emergence is computed from next generation's hosts.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Escape fraction exp(-a*P); H' = lam*H*escape and P' = c*H*(1-escape) computed from the same generation; equilibrium [lam*ln(lam)/((lam-1)*a*c), ln(lam)/a] rounded 4 when lam>1, a>0, c>0 else None; return [equilibrium, trajectory of [H,P] rounded 4].

Why this case matters

Population projections set harvest quotas, conservation status and pest-control timing; a wrong update order, boundary or rate conversion silently changes management advice.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: greenhouse whitefly	`[[27.7259, 13.8629], [[36.3918, 14.3191], [35.5713, 18.1867], [28.6557, 17.1134], [24.3573, 14.0055], [24.1843, 12.178]]]`	`[[27.7259, 13.8629], [[36.3918, 11.8041], [40.3377, 16.223], [35.848, 22.4138], [23.3768, 24.1595], [13.97, 16.3918]]]`	Failed

MEMBER ARCHIVE

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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