1Bigarray.Genarray(3) OCaml library Bigarray.Genarray(3)
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6 Bigarray.Genarray - no description
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9 Module Bigarray.Genarray
10
12 Module Genarray
13 : sig end
14 type ('a, 'b, 'c) t
22 The type Genarray.t is the type of Bigarrays with variable numbers of
25 dimensions. Any number of dimensions between 0 and 16 is supported.
26 The three type parameters to Genarray.t identify the array element kind
28 and layout, as follows:
29 -the first parameter, 'a , is the OCaml type for accessing array ele‐
31 ments ( float , int , int32 , int64 , nativeint );
32 -the second parameter, 'b , is the actual kind of array elements (
34 float32_elt , float64_elt , int8_signed_elt , int8_unsigned_elt , etc);
35 -the third parameter, 'c , identifies the array layout ( c_layout or
37 fortran_layout ).
38 For instance, (float, float32_elt, fortran_layout) Genarray.t is the
40 type of generic Bigarrays containing 32-bit floats in Fortran layout;
41 reads and writes in this array use the OCaml type float .
42 val create : ('a, 'b) Bigarray.kind -> 'c Bigarray.layout -> int array
46 -> ('a, 'b, 'c) t
47 Genarray.create kind layout dimensions returns a new Bigarray whose el‐
50 ement kind is determined by the parameter kind (one of float32 ,
51 float64 , int8_signed , etc) and whose layout is determined by the pa‐
52 rameter layout (one of c_layout or fortran_layout ). The dimensions
53 parameter is an array of integers that indicate the size of the Bigar‐
54 ray in each dimension. The length of dimensions determines the number
55 of dimensions of the Bigarray.
56 For instance, Genarray.create int32 c_layout [|4;6;8|] returns a fresh
58 Bigarray of 32-bit integers, in C layout, having three dimensions, the
59 three dimensions being 4, 6 and 8 respectively.
60 Bigarrays returned by Genarray.create are not initialized: the initial
62 values of array elements is unspecified.
63 Genarray.create raises Invalid_argument if the number of dimensions is
66 not in the range 0 to 16 inclusive, or if one of the dimensions is neg‐
67 ative.
68 val init : ('a, 'b) Bigarray.kind -> 'c Bigarray.layout -> int array ->
72 (int array -> 'a) -> ('a, 'b, 'c) t
73 Genarray.init kind layout dimensions f returns a new Bigarray b whose
76 element kind is determined by the parameter kind (one of float32 ,
77 float64 , int8_signed , etc) and whose layout is determined by the pa‐
78 rameter layout (one of c_layout or fortran_layout ). The dimensions
79 parameter is an array of integers that indicate the size of the Bigar‐
80 ray in each dimension. The length of dimensions determines the number
81 of dimensions of the Bigarray.
82 Each element Genarray.get b i is initialized to the result of f i . In
84 other words, Genarray.init kind layout dimensions f tabulates the re‐
85 sults of f applied to the indices of a new Bigarray whose layout is de‐
86 scribed by kind , layout and dimensions . The index array i may be
87 shared and mutated between calls to f.
88 For instance, Genarray.init int c_layout [|2; 1; 3|]
90 (Array.fold_left (+) 0) returns a fresh Bigarray of integers, in
91 C layout, having three dimensions (2, 1, 3, respectively), with the el‐
92 ement values 0, 1, 2, 1, 2, 3.
93 Genarray.init raises Invalid_argument if the number of dimensions is
96 not in the range 0 to 16 inclusive, or if one of the dimensions is neg‐
97 ative.
98 Since 4.12.0
101 val num_dims : ('a, 'b, 'c) t -> int
105 Return the number of dimensions of the given Bigarray.
107 val dims : ('a, 'b, 'c) t -> int array
111 Genarray.dims a returns all dimensions of the Bigarray a , as an array
114 of integers of length Genarray.num_dims a .
115 val nth_dim : ('a, 'b, 'c) t -> int -> int
119 Genarray.nth_dim a n returns the n -th dimension of the Bigarray a .
122 The first dimension corresponds to n = 0 ; the second dimension corre‐
123 sponds to n = 1 ; the last dimension, to n = Genarray.num_dims a - 1 .
124 Raises Invalid_argument if n is less than 0 or greater or equal than
127 Genarray.num_dims a .
128 val kind : ('a, 'b, 'c) t -> ('a, 'b) Bigarray.kind
132 Return the kind of the given Bigarray.
134 val layout : ('a, 'b, 'c) t -> 'c Bigarray.layout
138 Return the layout of the given Bigarray.
140 val change_layout : ('a, 'b, 'c) t -> 'd Bigarray.layout -> ('a, 'b,
144 'd) t
145 Genarray.change_layout a layout returns a Bigarray with the specified
148 layout , sharing the data with a (and hence having the same dimensions
149 as a ). No copying of elements is involved: the new array and the orig‐
150 inal array share the same storage space. The dimensions are reversed,
151 such that get v [| a; b |] in C layout becomes get v [| b+1; a+1 |] in
152 Fortran layout.
153 Since 4.04.0
156 val size_in_bytes : ('a, 'b, 'c) t -> int
160 size_in_bytes a is the number of elements in a multiplied by a 's Bi‐
163 garray.kind_size_in_bytes .
164 Since 4.03.0
167 val get : ('a, 'b, 'c) t -> int array -> 'a
171 Read an element of a generic Bigarray. Genarray.get a [|i1; ...; iN|]
173 returns the element of a whose coordinates are i1 in the first dimen‐
174 sion, i2 in the second dimension, ..., iN in the N -th dimension.
175 If a has C layout, the coordinates must be greater or equal than 0 and
177 strictly less than the corresponding dimensions of a . If a has For‐
178 tran layout, the coordinates must be greater or equal than 1 and less
179 or equal than the corresponding dimensions of a .
180 If N > 3 , alternate syntax is provided: you can write a.{i1, i2, ...,
182 iN} instead of Genarray.get a [|i1; ...; iN|] . (The syntax a.{...}
183 with one, two or three coordinates is reserved for accessing one-, two-
184 and three-dimensional arrays as described below.)
185 Raises Invalid_argument if the array a does not have exactly N dimen‐
188 sions, or if the coordinates are outside the array bounds.
189 val set : ('a, 'b, 'c) t -> int array -> 'a -> unit
193 Assign an element of a generic Bigarray. Genarray.set a [|i1; ...;
195 iN|] v stores the value v in the element of a whose coordinates are i1
196 in the first dimension, i2 in the second dimension, ..., iN in the N
197 -th dimension.
198 The array a must have exactly N dimensions, and all coordinates must
200 lie inside the array bounds, as described for Genarray.get ; otherwise,
201 Invalid_argument is raised.
202 If N > 3 , alternate syntax is provided: you can write a.{i1, i2, ...,
204 iN} <- v instead of Genarray.set a [|i1; ...; iN|] v . (The syntax
205 a.{...} <- v with one, two or three coordinates is reserved for updat‐
206 ing one-, two- and three-dimensional arrays as described below.)
207 val sub_left : ('a, 'b, Bigarray.c_layout) t -> int -> int -> ('a, 'b,
211 Bigarray.c_layout) t
212 Extract a sub-array of the given Bigarray by restricting the first
214 (left-most) dimension. Genarray.sub_left a ofs len returns a Bigarray
215 with the same number of dimensions as a , and the same dimensions as a
216 , except the first dimension, which corresponds to the interval [ofs
217 ... ofs + len - 1] of the first dimension of a . No copying of ele‐
218 ments is involved: the sub-array and the original array share the same
219 storage space. In other terms, the element at coordinates [|i1; ...;
220 iN|] of the sub-array is identical to the element at coordinates
221 [|i1+ofs; ...; iN|] of the original array a .
222 Genarray.sub_left applies only to Bigarrays in C layout.
225 Raises Invalid_argument if ofs and len do not designate a valid sub-ar‐
228 ray of a , that is, if ofs < 0 , or len < 0 , or ofs + len > Genar‐
229 ray.nth_dim a 0 .
230 val sub_right : ('a, 'b, Bigarray.fortran_layout) t -> int -> int ->
234 ('a, 'b, Bigarray.fortran_layout) t
235 Extract a sub-array of the given Bigarray by restricting the last
237 (right-most) dimension. Genarray.sub_right a ofs len returns a Bigar‐
238 ray with the same number of dimensions as a , and the same dimensions
239 as a , except the last dimension, which corresponds to the interval
240 [ofs ... ofs + len - 1] of the last dimension of a . No copying of el‐
241 ements is involved: the sub-array and the original array share the same
242 storage space. In other terms, the element at coordinates [|i1; ...;
243 iN|] of the sub-array is identical to the element at coordinates [|i1;
244 ...; iN+ofs|] of the original array a .
245 Genarray.sub_right applies only to Bigarrays in Fortran layout.
248 Raises Invalid_argument if ofs and len do not designate a valid sub-ar‐
251 ray of a , that is, if ofs < 1 , or len < 0 , or ofs + len > Genar‐
252 ray.nth_dim a (Genarray.num_dims a - 1) .
253 val slice_left : ('a, 'b, Bigarray.c_layout) t -> int array -> ('a, 'b,
257 Bigarray.c_layout) t
258 Extract a sub-array of lower dimension from the given Bigarray by fix‐
260 ing one or several of the first (left-most) coordinates. Genar‐
261 ray.slice_left a [|i1; ... ; iM|] returns the 'slice' of a obtained by
262 setting the first M coordinates to i1 , ..., iM . If a has N dimen‐
263 sions, the slice has dimension N - M , and the element at coordinates
264 [|j1; ...; j(N-M)|] in the slice is identical to the element at coordi‐
265 nates [|i1; ...; iM; j1; ...; j(N-M)|] in the original array a . No
266 copying of elements is involved: the slice and the original array share
267 the same storage space.
268 Genarray.slice_left applies only to Bigarrays in C layout.
271 Raises Invalid_argument if M >= N , or if [|i1; ... ; iM|] is outside
274 the bounds of a .
275 val slice_right : ('a, 'b, Bigarray.fortran_layout) t -> int array ->
279 ('a, 'b, Bigarray.fortran_layout) t
280 Extract a sub-array of lower dimension from the given Bigarray by fix‐
282 ing one or several of the last (right-most) coordinates. Genar‐
283 ray.slice_right a [|i1; ... ; iM|] returns the 'slice' of a obtained by
284 setting the last M coordinates to i1 , ..., iM . If a has N dimen‐
285 sions, the slice has dimension N - M , and the element at coordinates
286 [|j1; ...; j(N-M)|] in the slice is identical to the element at coordi‐
287 nates [|j1; ...; j(N-M); i1; ...; iM|] in the original array a . No
288 copying of elements is involved: the slice and the original array share
289 the same storage space.
290 Genarray.slice_right applies only to Bigarrays in Fortran layout.
293 Raises Invalid_argument if M >= N , or if [|i1; ... ; iM|] is outside
296 the bounds of a .
297 val blit : ('a, 'b, 'c) t -> ('a, 'b, 'c) t -> unit
301 Copy all elements of a Bigarray in another Bigarray. Genarray.blit src
303 dst copies all elements of src into dst . Both arrays src and dst must
304 have the same number of dimensions and equal dimensions. Copying a
305 sub-array of src to a sub-array of dst can be achieved by applying
306 Genarray.blit to sub-array or slices of src and dst .
307 val fill : ('a, 'b, 'c) t -> 'a -> unit
311 Set all elements of a Bigarray to a given value. Genarray.fill a v
313 stores the value v in all elements of the Bigarray a . Setting only
314 some elements of a to v can be achieved by applying Genarray.fill to a
315 sub-array or a slice of a .
316OCamldoc 2021-07-22 Bigarray.Genarray(3)