FA-97375 / Knitting and sewing pattern grading / Member archive

Evenly spaced increase row: symmetric remainder · case 05

Leftover stitches pile up on the right edge of a flat row, making the increases lopsided.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Distribute increases (m1) evenly over stitches. Flat rows use increases+1 segments with no increase at the edges; rounds use `increases` segments each followed by m1. Segment length is stitches // segments; the remainder adds one stitch to segments in order: rounds from the start, flat rows alternating from the outside in (first, last, second, second-last...). Segments must hold at least one stitch, else "error: too many increases". 0 increases -> "k<n>"; negative counts or no stitches -> "error: counts". Output "k4, m1, k5, ...".

Why this case matters

Yoke, cuff-to-body and hem transitions ask knitters to increase evenly across a row.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
flat with remainder	`"k6, m1, k6, m1, k6, m1, k5"`	`"k6, m1, k6, m1, k5, m1, k6"`	Failed

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