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apl: ⍸ where — monadic indices-of-truthy + dyadic interval-index
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- apl-where (monadic): ravel scan, filter non-zero, +⎕IO offsets
- apl-interval-index (dyadic): count of breaks ≤ y; broadcasts over
  scalar or vector Y
- Wired into apl-monadic-fn / apl-dyadic-fn cond chains
- +10 pipeline tests covering both arities, ⎕IO offsetting, edge cases
  (empty mask, all-truthy, y below/above all breaks)
- pipeline 109/109
This commit is contained in:
giles
2026-05-08 22:35:35 +00:00
parent 58c6ec27f3
commit 8cdebbe305
4 changed files with 71 additions and 1 deletions
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plans/apl-on-sx.md
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@@ -233,7 +233,7 @@ Phase 9 left seven glyphs that the parser recognises but the runtime
cannot evaluate, and two source files (`life.apl`, `quicksort.apl`) that
still need work to run as-written. Phase 10 closes both.
- [ ] **`⍸` where** — monadic `⍸ B` returns the indices of the truthy
- [x] **`⍸` where** — monadic `⍸ B` returns the indices of the truthy
cells (1-based per `⎕IO`). Dyadic `X ⍸ Y` is interval index (find
the largest `i` such that `X[i] ≤ Y`). Add `apl-where` + dyadic
`apl-interval-index`; wire both into `apl-monadic-fn` / `apl-dyadic-fn`.
@@ -288,6 +288,7 @@ data; format for string templating.
_Newest first._
- 2026-05-08: Phase 10 step 1 — `⍸` where. apl-where (monadic, indices of truthy cells, ⎕IO-respecting) + apl-interval-index (dyadic, count of breaks ≤ y; broadcasts over Y vector or scalar). Wired into apl-monadic-fn / apl-dyadic-fn (cond clauses inserted as proper siblings via sx_insert_child after sx_insert_near silently wrapped multi-form sources in `(begin …)`). +10 tests; pipeline 109/109
- 2026-05-08: Phase 10 added — fill runtime gaps (⍸ ∪ ∩ ⊥ ⊤ ⊆ ⍎) + life.apl and quicksort.apl as-written
- 2026-05-07: Phase 9 step 6 — glyph audit. Wired ⍉ → apl-transpose/apl-transpose-dyadic, ⊢ → monadic+dyadic identity-right, ⊣ → identity-left, ⍕ → apl-quad-fmt. +6 tests; **Phase 9 complete, all unchecked items ticked**; pipeline 99/99
- 2026-05-07: Phase 9 step 5 — primes.apl runs as-written end-to-end. Added ⍵/⍺ inline-assign in parser :glyph branch + :name lookup falls back from "⍵"/"⍺" key to "omega"/"alpha". `apl-run "primes ← {(2=+⌿0=⍵∘.|⍵)/⍵←⍳⍵} ⋄ primes 50"` → 15 primes. +4 e2e tests; pipeline 93/93