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{-# OPTIONS --without-K --safe #-}

open import Level using (Level)
open import Algebra using (Semiring)

module Data.Matrix.Functional {c  : Level} (R : Semiring c ) where

open import Data.Bool using (if_then_else_)
open import Data.Fin using (Fin; _≟_)
open import Data.Nat using ()
open import Data.Vec.Functional using (Vector; head; tail)
open import Function using (flip)
open import Relation.Binary.PropositionalEquality as  using (_≡_; _≗_)
open import Relation.Nullary.Decidable using (⌊_⌋)

open Semiring R
open Matrix :     Set c
Matrix n m = Vector (Vector Carrier m) n

sum : {n : }  Vector Carrier n  Carrier
sum {zero} _ = 0#
sum {suc n} v = head v + sum (tail v)

sum-cong : {n : } {V W : Vector Carrier n}  V  W  sum V  sum W
sum-cong {zero} V≗W = ≡.refl
sum-cong {suc n} {V} {W} V≗W = ≡.cong₂ _+_ (V≗W Fin.zero) (sum-cong (λ i  V≗W (Fin.suc i)))

_⟨*⟩_ : {n : }  Vector Carrier n  Vector Carrier n  Vector Carrier n
_⟨*⟩_ v w i = v i * w i

_⟨+⟩_ : {n : }  Vector Carrier n  Vector Carrier n  Vector Carrier n
_⟨+⟩_ v w i = v i + w i

_[+]_ : {n m : }  Matrix n m  Matrix n m  Matrix n m
_[+]_ v w i = v i ⟨+⟩ w i

_∙_ : {n : }  Vector Carrier n  Vector Carrier n  Carrier
_∙_ v w = sum (v ⟨*⟩ w)

_·_ : {n m o : }  Matrix m o  Matrix n m  Matrix n o
_·_ A B i j = flip A j  B i

identity : {n : }  Matrix n n
identity {n} i j = if  i  j  then 1# else 0#