-
-
Notifications
You must be signed in to change notification settings - Fork 400
/
index.d.ts
74 lines (67 loc) · 2.14 KB
/
index.d.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
/*
* @license Apache-2.0
*
* Copyright (c) 2019 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// TypeScript Version: 2.0
/// <reference types="@stdlib/types"/>
/**
* If provided input values, the accumulator function returns an updated mean percentage error. If not provided input values, the accumulator function returns the current mean percentage error.
*
* ## Notes
*
* - If provided `NaN` or a value which, when used in computations, results in `NaN`, the accumulated value is `NaN` for all future invocations.
*
* @param f - input value
* @param a - input value
* @returns mean percentage error or null
*/
type accumulator = ( f?: number, a?: number ) => number | null;
/**
* Returns an accumulator function which incrementally computes a moving mean percentage error.
*
* ## Notes
*
* - The `W` parameter defines the number of values over which to compute the moving mean percentage error.
* - As `W` (f,a) pairs are needed to fill the window buffer, the first `W-1` returned values are calculated from smaller sample sizes. Until the window is full, each returned value is calculated from all provided values.
*
* @param W - window size
* @throws must provide a positive integer
* @returns accumulator function
*
* @example
* var accumulator = incrmmpe( 3 );
*
* var m = accumulator();
* // returns null
*
* m = accumulator( 2.0, 3.0 );
* // returns ~33.33
*
* m = accumulator( 5.0, 2.0 );
* // returns ~-58.33
*
* m = accumulator( 3.0, 2.0 );
* // returns ~-55.56
*
* m = accumulator( 2.0, 5.0 );
* // returns ~-46.67
*
* m = accumulator();
* // returns ~-46.67
*/
declare function incrmmpe( W: number ): accumulator;
// EXPORTS //
export = incrmmpe;