6.8 Conversion
syntax
(Listof* A)
syntax
(Vectorof* A)
procedure
(list->array lst) → (Array A)
lst : (Listof A) (list->array ds lst) → (Array A) ds : In-Indexes lst : (Listof A)
procedure
(array->list arr) → (Listof A)
arr : (Array A)
The two-argument variant of list->array assumes the elements in lst are in row-major order.
For array->list, if arr has no axes or more than one axis, it is (conceptually) flattened before being converted to a list.
> (list->array '(1 2 3))
- : #(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Positive-Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array #[1 2 3])
> (list->array '((1 2 3) (4 5)))
- : #(struct:Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes
(U (List One Positive-Byte Positive-Byte)
(List Positive-Byte Positive-Byte))))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array #['(1 2 3) '(4 5)])
> (list->array #(2 2) '(1 2 3 4))
- : #(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Positive-Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array #[#[1 2] #[3 4]])
> (array->list (array #[1 2 3])) - : (Listof Positive-Byte)
'(1 2 3)
> (array->list (array 10)) - : (Listof Positive-Byte)
'(10)
> (array->list (array #[#[1 2 3] #[4 5 6]])) - : (Listof Positive-Byte)
'(1 2 3 4 5 6)
The arrays returned by list->array are always strict.
procedure
(vector->array vec) → (Mutable-Array A)
vec : (Vectorof A) (vector->array ds vec) → (Mutable-Array A) ds : In-Indexes vec : (Vectorof A)
procedure
(array->vector arr) → (Vectorof A)
arr : (Array A)
> (vector->array #(1 2 3))
- : #(struct:Mutable-Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes Integer)
(-> Indexes Integer Void)
(Vectorof Integer))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-mutable-array.rkt:14:13 prop:custom-write>)
(mutable-array #[1 2 3])
> (vector->array #((1 2 3) (4 5)))
- : #(struct:Mutable-Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes
(U (List One Positive-Byte Positive-Byte)
(List Positive-Byte Positive-Byte)))
(-> Indexes
(U (List One Positive-Byte Positive-Byte)
(List Positive-Byte Positive-Byte))
Void)
(Vectorof
(U (List One Positive-Byte Positive-Byte)
(List Positive-Byte Positive-Byte))))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-mutable-array.rkt:14:13 prop:custom-write>)
(mutable-array #['(1 2 3) '(4 5)])
> (vector->array #(2 2) #(1 2 3 4))
- : #(struct:Mutable-Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes Integer)
(-> Indexes Integer Void)
(Vectorof Integer))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-mutable-array.rkt:14:13 prop:custom-write>)
(mutable-array #[#[1 2] #[3 4]])
> (array->vector (array #[1 2 3])) - : (Vectorof Integer)
'#(1 2 3)
> (array->vector (array 10)) - : (Vectorof Integer)
'#(10)
> (array->vector (array #[#[1 2 3] #[4 5 6]])) - : (Vectorof Integer)
'#(1 2 3 4 5 6)
> (list*->array 'singleton symbol?)
- : #(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Symbol))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array 'singleton)
> (list*->array '(0 1 2 3) byte?)
- : #(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(mutable-array #[0 1 2 3])
> (list*->array (list (list (list 5) (list 2 3)) (list (list 4.0) (list 1.4 0.2 9.3))) (make-predicate (Listof Nonnegative-Real)))
- : #(struct:Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes (Listof Nonnegative-Real)))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(mutable-array #[#['(5) '(2 3)] #['(4.0) '(1.4 0.2 9.3)]])
There is no well-typed Typed Racket function that behaves like list*->array but does not require pred?. Without an element predicate, there is no way to prove to the type checker that list*->array’s implementation correctly distinguishes elements from rows.
The arrays returned by list*->array are always strict.
procedure
(array->list* arr) → (Listof* A)
arr : (Array A)
procedure
(vector*->array vecs pred?) → (Mutable-Array A)
vecs : (Vectorof* A) pred? : ((Vectorof* A) -> Any : A)
> (vector*->array 'singleton symbol?)
- : #(struct:Mutable-Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes Symbol)
(-> Indexes Symbol Void)
(Vectorof Symbol))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-mutable-array.rkt:14:13 prop:custom-write>)
(mutable-array 'singleton)
> ((inst vector*->array Byte) #(0 1 2 3) byte?)
- : #(struct:Mutable-Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes Byte)
(-> Indexes Byte Void)
(Vectorof Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-mutable-array.rkt:14:13 prop:custom-write>)
(mutable-array #[0 1 2 3])
procedure
(array->vector* arr) → (Vectorof* A)
arr : (Array A)
procedure
(array-list->array arrs [axis]) → (Array A)
arrs : (Listof (Array A)) axis : Integer = 0
> (array-list->array (list (array 0) (array 1) (array 2) (array 3)))
- : #(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array #[0 1 2 3])
> (array-list->array (list (array 0) (array 1) (array 2) (array 3)) 1) array-list->array: expected axis Index <= 0; given 1
> (array-list->array (list (array #[0 1 2 3]) (array #['a 'b 'c 'd])))
- : #(struct:Array
(Indexes
Index
(Boxof Boolean)
(-> Void)
(-> Indexes (U 'a 'b 'c 'd Byte)))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array #[#[0 1 2 3] #['a 'b 'c 'd]])
> (array-list->array (list (array #[0 1 2 3]) (array '!)))
- : #(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes (U '! Byte)))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array #[#[0 1 2 3] #['! '! '! '!]])
> (array-list->array (list (array #[0 1 2 3]) (array '!)) 1)
- : #(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes (U '! Byte)))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>)
(array #[#[0 '!] #[1 '!] #[2 '!] #[3 '!]])
For a similar function that does not increase the dimension of the broadcast arrays, see array-append*.
procedure
(array->array-list arr [axis]) → (Listof (Array A))
arr : (Array A) axis : Integer = 0
> (array->array-list (array #[0 1 2 3]))
- : (Listof
#(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>))
(list (array 0) (array 1) (array 2) (array 3))
> (array->array-list (array #[#[1 2] #[10 20]]))
- : (Listof
#(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Positive-Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>))
(list (array #[1 2]) (array #[10 20]))
> (array->array-list (array #[#[1 2] #[10 20]]) 1)
- : (Listof
#(struct:Array
(Indexes Index (Boxof Boolean) (-> Void) (-> Indexes Positive-Byte))
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:56:13 prop:equal+hash>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:55:13 prop:custom-write>
#<syntax:build/user/8.15.0.1/pkgs/math-lib/math/private/array/typed-array-struct.rkt:54:13 prop:custom-print-quotable>))
(list (array #[1 10]) (array #[2 20]))
> (array->array-list (array 10)) array->array-list: expected axis Index < 0; given 0
6.8.1 Printing
parameter
(array-custom-printer) →
(All (A) ((Array A) Symbol Output-Port (U Boolean 0 1) -> Any)) (array-custom-printer print-array) → void?
print-array :
(All (A) ((Array A) Symbol Output-Port (U Boolean 0 1) -> Any))
procedure
(print-array arr name port mode) → Any
arr : (Array A) name : Symbol port : Output-Port mode : (U Boolean 0 1)
> ((array-custom-printer) (array #[0 1 2 3]) 'my-cool-array (current-output-port) #t) (my-cool-array #[0 1 2 3])