time-to-botec

Benchmark sampling in different programming languages
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ndarray.js (2314B)

      1 /**
      2 * @license Apache-2.0
      3 *
      4 * Copyright (c) 2020 The Stdlib Authors.
      5 *
      6 * Licensed under the Apache License, Version 2.0 (the "License");
      7 * you may not use this file except in compliance with the License.
      8 * You may obtain a copy of the License at
      9 *
     10 *    http://www.apache.org/licenses/LICENSE-2.0
     11 *
     12 * Unless required by applicable law or agreed to in writing, software
     13 * distributed under the License is distributed on an "AS IS" BASIS,
     14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15 * See the License for the specific language governing permissions and
     16 * limitations under the License.
     17 */
     18 
     19 'use strict';
     20 
     21 // MODULES //
     22 
     23 var isnanf = require( '@stdlib/math/base/assert/is-nanf' );
     24 var abs = require( '@stdlib/math/base/special/abs' );
     25 
     26 
     27 // MAIN //
     28 
     29 /**
     30 * Computes the cumulative minimum absolute value of single-precision floating-point strided array elements.
     31 *
     32 * @param {PositiveInteger} N - number of indexed elements
     33 * @param {Float32Array} x - input array
     34 * @param {integer} strideX - `x` stride length
     35 * @param {NonNegativeInteger} offsetX - starting index for `x`
     36 * @param {Float32Array} y - output array
     37 * @param {integer} strideY - `y` stride length
     38 * @param {NonNegativeInteger} offsetY - starting index for `y`
     39 * @returns {Float32Array} output array
     40 *
     41 * @example
     42 * var Float32Array = require( '@stdlib/array/float32' );
     43 * var floor = require( '@stdlib/math/base/special/floor' );
     44 *
     45 * var x = new Float32Array( [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ] );
     46 * var y = new Float32Array( x.length );
     47 * var N = floor( x.length / 2 );
     48 *
     49 * var v = scuminabs( N, x, 2, 1, y, 1, 0 );
     50 * // returns <Float32Array>[ 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0 ]
     51 */
     52 function scuminabs( N, x, strideX, offsetX, y, strideY, offsetY ) {
     53 	var min;
     54 	var ix;
     55 	var iy;
     56 	var v;
     57 	var i;
     58 
     59 	if ( N <= 0 ) {
     60 		return y;
     61 	}
     62 	ix = offsetX;
     63 	iy = offsetY;
     64 
     65 	min = abs( x[ ix ] );
     66 	y[ iy ] = min;
     67 
     68 	iy += strideY;
     69 	i = 1;
     70 	if ( isnanf( min ) === false ) {
     71 		for ( i; i < N; i++ ) {
     72 			ix += strideX;
     73 			v = abs( x[ ix ] );
     74 			if ( isnanf( v ) ) {
     75 				min = v;
     76 				break;
     77 			}
     78 			if ( v < min ) {
     79 				min = v;
     80 			}
     81 			y[ iy ] = min;
     82 			iy += strideY;
     83 		}
     84 	}
     85 	if ( isnanf( min ) ) {
     86 		for ( i; i < N; i++ ) {
     87 			y[ iy ] = min;
     88 			iy += strideY;
     89 		}
     90 	}
     91 	return y;
     92 }
     93 
     94 
     95 // EXPORTS //
     96 
     97 module.exports = scuminabs;