FA-69052 / Tide and marine navigation tables / Member archive

High and low water extraction: Ripples exactly at the threshold are discarded · case 02

A genuine event whose height difference equals minr disappears.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input [h, dt, minr]: equally spaced heights every dt minutes. Interior extrema (plateaus collapse to their midpoint time) are candidates; series endpoints never are. A candidate of the same type as the last accepted event replaces it only if more extreme; otherwise a candidate whose height differs from the last accepted event by less than minr is ignored. Return [[type, minutes, height], ...].

Why this case matters

Tide tables and passage plans turn published predictions into go/no-go decisions about depth, clearance and timing.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
high and low water extraction [[2.0, 1.0, 2.0, 1.0, 2.0, 1.0], 10, 1.0]	`[["LW", 30.0, 1.0]]`	`[["LW", 10.0, 1.0], ["HW", 20.0, 2.0], ["LW", 30.0, 1.0], ["HW", 40.0, 2.0]]`	Failed

MEMBER ARCHIVE

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

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