time-to-botec

Benchmark sampling in different programming languages
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README.md (3789B)

      1 <!--
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      3 @license Apache-2.0
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      5 Copyright (c) 2019 The Stdlib Authors.
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      7 Licensed under the Apache License, Version 2.0 (the "License");
      8 you may not use this file except in compliance with the License.
      9 You may obtain a copy of the License at
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     11    http://www.apache.org/licenses/LICENSE-2.0
     12 
     13 Unless required by applicable law or agreed to in writing, software
     14 distributed under the License is distributed on an "AS IS" BASIS,
     15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     16 See the License for the specific language governing permissions and
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     19 -->
     20 
     21 # itermmaxabs
     22 
     23 > Create an [iterator][mdn-iterator-protocol] which iteratively computes a moving maximum absolute value.
     24 
     25 <section class="intro">
     26 
     27 </section>
     28 
     29 <!-- /.intro -->
     30 
     31 <!-- Package usage documentation. -->
     32 
     33 <section class="usage">
     34 
     35 ## Usage
     36 
     37 ```javascript
     38 var itermmaxabs = require( '@stdlib/stats/iter/mmaxabs' );
     39 ```
     40 
     41 #### itermmaxabs( iterator, W )
     42 
     43 Returns an [iterator][mdn-iterator-protocol] which iteratively computes a moving maximum absolute value. The `W` parameter defines the number of iterated values over which to compute the moving maximum absolute value.
     44 
     45 ```javascript
     46 var array2iterator = require( '@stdlib/array/to-iterator' );
     47 
     48 var arr = array2iterator( [ 2.0, 1.0, 3.0, -7.0, -5.0 ] );
     49 var it = itermmaxabs( arr, 3 );
     50 
     51 // Fill the window...
     52 var m = it.next().value; // [2.0]
     53 // returns 2.0
     54 
     55 m = it.next().value; // [2.0, 1.0]
     56 // returns 2.0
     57 
     58 m = it.next().value; // [2.0, 1.0, 3.0]
     59 // returns 3.0
     60 
     61 // Window begins sliding...
     62 m = it.next().value; // [1.0, 3.0, -7.0]
     63 // returns 7.0
     64 
     65 m = it.next().value; // [3.0, -7.0, -5.0]
     66 // returns 7.0
     67 ```
     68 
     69 </section>
     70 
     71 <!-- /.usage -->
     72 
     73 <!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
     74 
     75 <section class="notes">
     76 
     77 ## Notes
     78 
     79 -   If an iterated value is non-numeric (including `NaN`), the function returns `NaN` for **at least** `W-1` future invocations. If non-numeric iterated values are possible, you are advised to provide an [`iterator`][mdn-iterator-protocol] which type checks and handles non-numeric values accordingly.
     80 -   As `W` values 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 previously iterated values.
     81 
     82 </section>
     83 
     84 <!-- /.notes -->
     85 
     86 <!-- Package usage examples. -->
     87 
     88 <section class="examples">
     89 
     90 ## Examples
     91 
     92 <!-- eslint no-undef: "error" -->
     93 
     94 ```javascript
     95 var runif = require( '@stdlib/random/iter/uniform' );
     96 var itermmaxabs = require( '@stdlib/stats/iter/mmaxabs' );
     97 
     98 // Create an iterator for generating uniformly distributed pseudorandom numbers:
     99 var rand = runif( -10.0, 10.0, {
    100     'seed': 1234,
    101     'iter': 100
    102 });
    103 
    104 // Create an iterator for iteratively computing a moving maximum absolute value:
    105 var it = itermmaxabs( rand, 3 );
    106 
    107 // Perform manual iteration...
    108 var v;
    109 while ( true ) {
    110     v = it.next();
    111     if ( typeof v.value === 'number' ) {
    112         console.log( 'maxabs: %d', v.value );
    113     }
    114     if ( v.done ) {
    115         break;
    116     }
    117 }
    118 ```
    119 
    120 </section>
    121 
    122 <!-- /.examples -->
    123 
    124 <!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
    125 
    126 <section class="references">
    127 
    128 </section>
    129 
    130 <!-- /.references -->
    131 
    132 <!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
    133 
    134 <section class="links">
    135 
    136 [mdn-iterator-protocol]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#The_iterator_protocol
    137 
    138 </section>
    139 
    140 <!-- /.links -->