wave opなし → matrix(引数だけで決まる op —— 画像やデータの入力を取らない)import fullseye as fs; fs.ledger.wave_membrane_mode(kind='rectangular', m=2, n=3, shape=(256, 256), aspect=1.0, free_edge=True) (実装を直接呼ぶなら import mathops; mathops.wave_membrane_mode(kind='rectangular', m=2, n=3, shape=(256, 256), aspect=1.0, free_edge=True)、台帳から引くなら opsmath.get("wave_membrane_mode"))One eigenmode of a vibrating membrane — the shape the sand draws.
★This is a membrane, not a plate. The familiar Chladni pattern
cos(m pi x) cos(n pi y) - cos(n pi x) cos(m pi y) solves the Helmholtz
equation with free (Neumann) edges; a real Chladni plate obeys the
biharmonic equation and has a different frequency ladder. The pictures
look alike, the frequencies do not — so this op says membrane and is checked
against membrane truth only.
kind="rectangular" returns the (possibly combined) cosine mode over a
rectangle of the given aspect; kind="circular" returns
J_m(k r) cos(m theta) with k from the Bessel zero, zero outside the disc.
★Why this earns its place: the nodal lines of a rectangular mode are known
by count — a simple (m, n) mode has m-1 interior vertical and
n-1 horizontal nodal lines — and the circular mode’s nodal circles are at
the ratios of successive Bessel zeros. The drawing can therefore be graded.
Returns a matrix (signed displacement, peak scaled to 1). Use
:func:wave_nodal_lines for the zero set.
Raises ValueError: unknown kind; m/n below the valid range;
a grid over the cap; non-positive aspect; free_edge=True combined with
m == n for the combined mode (the difference vanishes identically).
HALCON: no operator.
mathops の全 op は入力を検証してから計算する(黙って通さない):
ValueError — float64 への強制変換は虚部を黙って捨てる(numpy は ComplexWarning だけ出して「もっともらしく間違った」実数を返す)。.real/.imag/abs() を明示するか、複素対応の complexops を使う。ValueError — マスクを剥がして下の生値を使う暗黙変換を拒否。埋める/落とすを明示する。ValueError(件数を明示して拒否 — 結果全体に伝播するため)。ValueError。reshape を明示する)。stat_histogram の bins は mathops.MAX_ELEMENTS(2^26 ≈ 6700 万要素)超で ValueError。py -3.11 examples/poc_beats_fringes_and_screens.pymatrix を入力に取れる)mat_solve · mat_lstsq · mat_svd · mat_eigh · mat_pinv · mat_cond · mat_lu · mat_qr
wave)wave_mode_frequencies · wave_nodal_lines · wave_two_slit · wave_fringe_period · wave_grating_orders
Provenance: mathops.py — MATH operator registry. この per-op ノートは tools/opdocs.py md が自動生成(手編集しない)。
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.