17 lines
464 B
Text
17 lines
464 B
Text
import data.matrix data.list
|
|
open matrix nat list
|
|
|
|
variables {A : Type} {m n : nat}
|
|
|
|
definition row_vector [reducible] (A : Type) (n : nat) := matrix A 1 n
|
|
definition get_row [reducible] (M : matrix A m n) (row : fin m) : row_vector A n :=
|
|
λ i j, M row j
|
|
|
|
variables (M : matrix A m n) (row : fin m) (col : fin n)
|
|
|
|
notation M `[` i `,` j `]` := val M i j
|
|
check M[row,col]
|
|
notation M `[` i `,` `:` `]` := get_row M i
|
|
check M[row,:]
|
|
check M[row,col]
|
|
check [1, 2, 3]
|