1Float.ArrayLabels(3)             OCaml library            Float.ArrayLabels(3)
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NAME

6       Float.ArrayLabels  -  Float  arrays with packed representation (labeled
7       functions).
8

Module

10       Module   Float.ArrayLabels
11

Documentation

13       Module ArrayLabels
14        : sig end
15
16
17       Float arrays with packed representation (labeled functions).
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21
22
23       type t = floatarray
24
25
26       The type of float arrays with packed representation.
27
28
29       Since 4.08.0
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31
32
33       val length : t -> int
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35       Return the length (number of elements) of the given floatarray.
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37
38
39       val get : t -> int -> float
40
41
42       get a n returns the element number n of floatarray a .
43
44
45       Raises Invalid_argument if n is outside the range 0 to (length a - 1) .
46
47
48
49       val set : t -> int -> float -> unit
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51
52       set a n x modifies floatarray a in place, replacing  element  number  n
53       with x .
54
55
56       Raises Invalid_argument if n is outside the range 0 to (length a - 1) .
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58
59
60       val make : int -> float -> t
61
62
63       make n x returns a fresh floatarray of length n , initialized with x .
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65
66       Raises Invalid_argument if n < 0 or n > Sys.max_floatarray_length .
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68
69
70       val create : int -> t
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72
73       create  n  returns  a fresh floatarray of length n , with uninitialized
74       data.
75
76
77       Raises Invalid_argument if n < 0 or n > Sys.max_floatarray_length .
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79
80
81       val init : int -> f:(int -> float) -> t
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83
84       init n ~f returns a fresh floatarray of length n , with element  number
85       i  initialized  to the result of f i .  In other terms, init n ~f tabu‐
86       lates the results of f applied to the integers 0 to n-1 .
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88
89       Raises Invalid_argument if n < 0 or n > Sys.max_floatarray_length .
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91
92
93       val append : t -> t -> t
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95
96       append v1 v2 returns a fresh floatarray containing the concatenation of
97       the floatarrays v1 and v2 .
98
99
100       Raises  Invalid_argument  if  length  v1 + length v2 > Sys.max_floatar‐
101       ray_length .
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103
104
105       val concat : t list -> t
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107       Same as Float.ArrayLabels.append , but concatenates a list of  floatar‐
108       rays.
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111
112       val sub : t -> pos:int -> len:int -> t
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114
115       sub  a  ~pos ~len returns a fresh floatarray of length len , containing
116       the elements number pos to pos + len - 1 of floatarray a .
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118
119       Raises Invalid_argument if pos and len do not designate a valid  subar‐
120       ray of a ; that is, if pos < 0 , or len < 0 , or pos + len > length a .
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122
123
124       val copy : t -> t
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126
127       copy a returns a copy of a , that is, a fresh floatarray containing the
128       same elements as a .
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130
131
132       val fill : t -> pos:int -> len:int -> float -> unit
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134
135       fill a ~pos ~len x modifies the floatarray a in place, storing x in el‐
136       ements number pos to pos + len - 1 .
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138
139       Raises  Invalid_argument if pos and len do not designate a valid subar‐
140       ray of a .
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142
143
144       val blit : src:t -> src_pos:int -> dst:t -> dst_pos:int ->  len:int  ->
145       unit
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147
148       blit ~src ~src_pos ~dst ~dst_pos ~len copies len elements from floatar‐
149       ray src , starting at element number src_pos  ,  to  floatarray  dst  ,
150       starting  at  element  number dst_pos .  It works correctly even if src
151       and dst are the same floatarray, and the source and destination  chunks
152       overlap.
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154
155       Raises  Invalid_argument  if  src_pos  and len do not designate a valid
156       subarray of src , or if dst_pos and len do not designate a valid subar‐
157       ray of dst .
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161       val to_list : t -> float list
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163
164       to_list a returns the list of all the elements of a .
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166
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168       val of_list : float list -> t
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170
171       of_list l returns a fresh floatarray containing the elements of l .
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173
174       Raises   Invalid_argument   if   the   length  of  l  is  greater  than
175       Sys.max_floatarray_length .
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179
180   Iterators
181       val iter : f:(float -> unit) -> t -> unit
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183
184       iter ~f a applies function f in turn to all the elements of a .  It  is
185       equivalent to f a.(0); f a.(1); ...; f a.(length a - 1); () .
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187
188
189       val iteri : f:(int -> float -> unit) -> t -> unit
190
191       Same  as  Float.ArrayLabels.iter , but the function is applied with the
192       index of the element as first argument, and the element itself as  sec‐
193       ond argument.
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196
197       val map : f:(float -> float) -> t -> t
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199
200       map  ~f  a  applies  function f to all the elements of a , and builds a
201       floatarray with the results returned by f .
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204
205       val mapi : f:(int -> float -> float) -> t -> t
206
207       Same as Float.ArrayLabels.map , but the function is applied to the  in‐
208       dex  of the element as first argument, and the element itself as second
209       argument.
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211
212
213       val fold_left : f:('a -> float -> 'a) -> init:'a -> t -> 'a
214
215
216       fold_left ~f x ~init computes f (... (f (f x init.(0))  init.(1))  ...)
217       init.(n-1) , where n is the length of the floatarray init .
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219
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221       val fold_right : f:(float -> 'a -> 'a) -> t -> init:'a -> 'a
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223
224       fold_right  f  a  init computes f a.(0) (f a.(1) ( ... (f a.(n-1) init)
225       ...))  , where n is the length of the floatarray a .
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227
228
229
230   Iterators on two arrays
231       val iter2 : f:(float -> float -> unit) -> t -> t -> unit
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233
234       Array.iter2 ~f a b applies function f to all the elements of a and b .
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236
237       Raises Invalid_argument if the floatarrays are not the same size.
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239
240
241       val map2 : f:(float -> float -> float) -> t -> t -> t
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243
244       map2 ~f a b applies function f to all the elements of a  and  b  ,  and
245       builds  a floatarray with the results returned by f : [| f a.(0) b.(0);
246       ...; f a.(length a - 1) b.(length b - 1)|] .
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248
249       Raises Invalid_argument if the floatarrays are not the same size.
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252
253
254   Array scanning
255       val for_all : f:(float -> bool) -> t -> bool
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257
258       for_all ~f [|a1; ...; an|] checks if all  elements  of  the  floatarray
259       satisfy  the  predicate f . That is, it returns (f a1) && (f a2) && ...
260       && (f an) .
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264       val exists : f:(float -> bool) -> t -> bool
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266
267       exists f [|a1; ...; an|] checks if at least one element of the floatar‐
268       ray satisfies the predicate f . That is, it returns (f a1) || (f a2) ||
269       ... || (f an) .
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272
273       val mem : float -> set:t -> bool
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275
276       mem a ~set is true if and only if there is an element of  set  that  is
277       structurally equal to a , i.e. there is an x in set such that compare a
278       x = 0 .
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281
282       val mem_ieee : float -> set:t -> bool
283
284       Same as Float.ArrayLabels.mem ,  but  uses  IEEE  equality  instead  of
285       structural equality.
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289
290   Sorting
291       val sort : cmp:(float -> float -> int) -> t -> unit
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293       Sort  a  floatarray in increasing order according to a comparison func‐
294       tion.  The comparison function must return 0 if its  arguments  compare
295       as  equal,  a  positive integer if the first is greater, and a negative
296       integer if the first is smaller (see below for  a  complete  specifica‐
297       tion).   For example, compare is a suitable comparison function.  After
298       calling sort , the array is sorted in place in increasing order.   sort
299       is  guaranteed  to run in constant heap space and (at most) logarithmic
300       stack space.
301
302       The current implementation uses Heap Sort.  It runs in  constant  stack
303       space.
304
305       Specification  of  the comparison function: Let a be the floatarray and
306       cmp the comparison function. The following must be true for all x , y ,
307       z in a :
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309       - cmp x y > 0 if and only if cmp y x < 0
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311       -     if cmp x y >= 0 and cmp y z >= 0 then cmp x z >= 0
312
313       When sort returns, a contains the same elements as before, reordered in
314       such a way that for all i and j valid indices of a :
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316       - cmp a.(i) a.(j) >= 0 if and only if i >= j
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321       val stable_sort : cmp:(float -> float -> int) -> t -> unit
322
323       Same as Float.ArrayLabels.sort , but the sorting  algorithm  is  stable
324       (i.e.   elements  that  compare equal are kept in their original order)
325       and not guaranteed to run in constant heap space.
326
327       The current  implementation  uses  Merge  Sort.  It  uses  a  temporary
328       floatarray of length n/2 , where n is the length of the floatarray.  It
329       is usually faster than the  current  implementation  of  Float.ArrayLa‐
330       bels.sort .
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332
333
334       val fast_sort : cmp:(float -> float -> int) -> t -> unit
335
336       Same   as  Float.ArrayLabels.sort  or  Float.ArrayLabels.stable_sort  ,
337       whichever is faster on typical input.
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339
340
341
342   Float arrays and Sequences
343       val to_seq : t -> float Seq.t
344
345       Iterate on the floatarray, in increasing order.  Modifications  of  the
346       floatarray during iteration will be reflected in the sequence.
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348
349
350       val to_seqi : t -> (int * float) Seq.t
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352       Iterate  on the floatarray, in increasing order, yielding indices along
353       elements. Modifications of the floatarray during iteration will be  re‐
354       flected in the sequence.
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356
357
358       val of_seq : float Seq.t -> t
359
360       Create an array from the generator.
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362
363
364       val map_to_array : f:(float -> 'a) -> t -> 'a array
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366
367       map_to_array  ~f  a  applies  function f to all the elements of a , and
368       builds an array with the results returned by f : [| f a.(0);  f  a.(1);
369       ...; f a.(length a - 1) |] .
370
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372
373       val map_from_array : f:('a -> float) -> 'a array -> t
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375
376       map_from_array  ~f  a applies function f to all the elements of a , and
377       builds a floatarray with the results returned by f .
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383OCamldoc                          2022-07-22              Float.ArrayLabels(3)