FA-65652 / Ecological population dynamics / Member archive

Insect degree-day accumulation with horizontal cutoff: minimum substitution · case 02

Cold nights subtract development accumulated during the day.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Daily max is capped at upper; daily min is raised to base and capped at upper; DD = max(0, mean - base); emergence day is the first 1-based day with cumulative DD >= target; return [cumulative rounded 2, day or None]; None when upper <= base.

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: never emerges	`[[0.0, 0.0], null]`	`[[1.0, 2.5], null]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

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

Member access is invitation-based. Sign in with your invited account to inspect the sources.