FA-97729 / Knitting and sewing pattern grading / Member archive

Post-wash swatch gauge: even row rounding · case 04

The body ends on a right-side row.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

A swatch of sts x rows measured before and after washing. Use post-wash dimensions: cast on = half-up target_w*sts/w_post; rows = target_h*rows/h_post rounded to the nearest even number (ties up); width change % = (w_post/w_pre - 1)*100 half-up to 0.1. Return [cast_on, rows, width_change].

Why this case matters

Knitters block swatches because many fibres grow or shrink after washing.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
growth	`[100, 173, 10.0]`	`[100, 174, 10.0]`	Failed

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