mathlib docs: core.data.vector

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def vector (α : Type u) (n : ℕ) :

Type u

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vector α n = {l // l.length = n}

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@[instance]

def vector.decidable_eq {α : Type u} {n : ℕ} [decidable_eq α] :

decidable_eq (vector α n)

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vector.decidable_eq = vector.decidable_eq._proof_1.mpr (λ (a b : {l // l.length = n}), subtype.decidable_eq a b)

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def vector.nil {α : Type u} :

vector α 0

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vector.nil = ⟨list.nil α, _⟩

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def vector.cons {α : Type u} {n : ℕ} (a : α) (a_1 : vector α n) :

vector α n.succ

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a :: ⟨v, h⟩ = ⟨a :: v, _⟩

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def vector.length {α : Type u} {n : ℕ} (v : vector α n) :

ℕ

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v.length = n

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def vector.head {α : Type u} {n : ℕ} (a : vector α n.succ) :

α

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vector.head ⟨a :: v, h⟩ = a
vector.head ⟨list.nil α, h⟩ = nat.no_confusion h

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@[simp]

theorem vector.head_cons {α : Type u} {n : ℕ} (a : α) (v : vector α n) :

(a :: v).head = a

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def vector.tail {α : Type u} {n : ℕ} (a : vector α n) :

vector α (n - 1)

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vector.tail ⟨a :: v, h⟩ = ⟨v, _⟩
vector.tail ⟨list.nil α, h⟩ = ⟨list.nil α, _⟩

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@[simp]

theorem vector.tail_cons {α : Type u} {n : ℕ} (a : α) (v : vector α n) :

(a :: v).tail = v

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@[simp]

theorem vector.cons_head_tail {α : Type u} {n : ℕ} (v : vector α n.succ) :

v.head :: v.tail = v

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def vector.to_list {α : Type u} {n : ℕ} (v : vector α n) :

list α

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v.to_list = v.val

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def vector.nth {α : Type u} {n : ℕ} (v : vector α n) (a : fin n) :

α

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vector.nth ⟨l, h⟩ i = l.nth_le i.val _

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def vector.append {α : Type u} {n m : ℕ} (a : vector α n) (a_1 : vector α m) :

vector α (n + m)

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vector.append ⟨l₁, h₁⟩ ⟨l₂, h₂⟩ = ⟨l₁ ++ l₂, _⟩

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def vector.elim {α : Type u_1} {C : Π {n : ℕ}, vector α n → Sort u} (H : Π (l : list α), C ⟨l, _⟩) {n : ℕ} (v : vector α n) :

C v

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vector.elim H ⟨l, h⟩ = vector.elim._match_1 H l n h
vector.elim._match_1 H l l.length rfl = H l

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def vector.map {α : Type u} {β : Type v} {n : ℕ} (f : α → β) (a : vector α n) :

vector β n

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vector.map f ⟨l, h⟩ = ⟨list.map f l, _⟩

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@[simp]

theorem vector.map_nil {α : Type u} {β : Type v} (f : α → β) :

vector.map f vector.nil = vector.nil

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theorem vector.map_cons {α : Type u} {β : Type v} {n : ℕ} (f : α → β) (a : α) (v : vector α n) :

vector.map f (a :: v) = f a :: vector.map f v

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def vector.map₂ {α : Type u} {β : Type v} {φ : Type w} {n : ℕ} (f : α → β → φ) (a : vector α n) (a_1 : vector β n) :

vector φ n

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vector.map₂ f ⟨x, _x⟩ ⟨y, _x_1⟩ = ⟨list.map₂ f x y, _⟩

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def vector.repeat {α : Type u} (a : α) (n : ℕ) :

vector α n

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vector.repeat a n = ⟨list.repeat a n, _⟩

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def vector.drop {α : Type u} {n : ℕ} (i : ℕ) (a : vector α n) :

vector α (n - i)

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vector.drop i ⟨l, p⟩ = ⟨list.drop i l, _⟩

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def vector.take {α : Type u} {n : ℕ} (i : ℕ) (a : vector α n) :

vector α (min i n)

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vector.take i ⟨l, p⟩ = ⟨list.take i l, _⟩

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def vector.remove_nth {α : Type u} {n : ℕ} (i : fin n) (a : vector α n) :

vector α (n - 1)

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vector.remove_nth i ⟨l, p⟩ = ⟨l.remove_nth i.val, _⟩

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def vector.of_fn {α : Type u} {n : ℕ} (a : fin n → α) :

vector α n

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vector.of_fn f = f 0 :: vector.of_fn (λ (i : fin n), f i.succ)
vector.of_fn f = vector.nil

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def vector.map_accumr {α : Type u} {β : Type v} {n : ℕ} {σ : Type} (f : α → σ → σ × β) (a : vector α n) (a_1 : σ) :

σ × vector β n

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vector.map_accumr f ⟨x, px⟩ c = let res : σ × list β := list.map_accumr f x c in (res.fst, ⟨res.snd, _⟩)

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def vector.map_accumr₂ {n : ℕ} {α β σ φ : Type} (f : α → β → σ → σ × φ) (a : vector α n) (a_1 : vector β n) (a_2 : σ) :

σ × vector φ n

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vector.map_accumr₂ f ⟨x, px⟩ ⟨y, py⟩ c = let res : σ × list φ := list.map_accumr₂ f x y c in (res.fst, ⟨res.snd, _⟩)

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theorem vector.eq {α : Type u} {n : ℕ} (a1 a2 : vector α n) (a : a1.to_list = a2.to_list) :

a1 = a2

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theorem vector.eq_nil {α : Type u} (v : vector α 0) :

v = vector.nil

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@[simp]

theorem vector.to_list_mk {α : Type u} {n : ℕ} (v : list α) (P : v.length = n) :

vector.to_list ⟨v, P⟩ = v

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@[simp]

theorem vector.to_list_nil {α : Type u} :

vector.nil.to_list = list.nil

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@[simp]

theorem vector.to_list_length {α : Type u} {n : ℕ} (v : vector α n) :

v.to_list.length = n

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@[simp]

theorem vector.to_list_cons {α : Type u} {n : ℕ} (a : α) (v : vector α n) :

(a :: v).to_list = a :: v.to_list

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@[simp]

theorem vector.to_list_append {α : Type u} {n m : ℕ} (v : vector α n) (w : vector α m) :

(v.append w).to_list = v.to_list ++ w.to_list

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@[simp]

theorem vector.to_list_drop {α : Type u} {n m : ℕ} (v : vector α m) :

(vector.drop n v).to_list = list.drop n v.to_list

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@[simp]

theorem vector.to_list_take {α : Type u} {n m : ℕ} (v : vector α m) :

(vector.take n v).to_list = list.take n v.to_list