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