time-to-botec

Benchmark sampling in different programming languages
Log | Files | Refs | README

main.js (2333B)

      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 // MAIN //
     22 
     23 /**
     24 * Applies a unary function accepting and returning double-precision floating-point numbers to each element in a double-precision floating-point strided input array and assigns each result to an element in a double-precision floating-point strided output array.
     25 *
     26 * @param {NonNegativeInteger} N - number of indexed elements
     27 * @param {Float64Array} x - input array
     28 * @param {integer} strideX - `x` stride length
     29 * @param {Uint8Array} mask - mask array
     30 * @param {integer} strideMask - `mask` stride length
     31 * @param {Float64Array} y - destination array
     32 * @param {integer} strideY - `y` stride length
     33 * @param {Function} fcn - unary function to apply
     34 * @returns {Float64Array} `y`
     35 *
     36 * @example
     37 * var Float64Array = require( '@stdlib/array/float64' );
     38 * var Uint8Array = require( '@stdlib/array/uint8' );
     39 *
     40 * function scale( x ) {
     41 *     return x * 10.0;
     42 * }
     43 *
     44 * var x = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );
     45 * var m = new Uint8Array( [ 0, 0, 1, 0, 0 ] );
     46 * var y = new Float64Array( x.length );
     47 *
     48 * dmskmap( x.length, x, 1, m, 1, y, 1, scale );
     49 *
     50 * console.log( y );
     51 * // => <Float64Array>[ 10.0, 20.0, 0.0, 40.0, 50.0 ]
     52 */
     53 function dmskmap( N, x, strideX, mask, strideMask, y, strideY, fcn ) {
     54 	var ix;
     55 	var im;
     56 	var iy;
     57 	var i;
     58 	if ( N <= 0 ) {
     59 		return y;
     60 	}
     61 	if ( strideX < 0 ) {
     62 		ix = (1-N) * strideX;
     63 	} else {
     64 		ix = 0;
     65 	}
     66 	if ( strideMask < 0 ) {
     67 		im = (1-N) * strideMask;
     68 	} else {
     69 		im = 0;
     70 	}
     71 	if ( strideY < 0 ) {
     72 		iy = (1-N) * strideY;
     73 	} else {
     74 		iy = 0;
     75 	}
     76 	for ( i = 0; i < N; i++ ) {
     77 		if ( mask[ im ] === 0 ) {
     78 			y[ iy ] = fcn( x[ ix ] );
     79 		}
     80 		ix += strideX;
     81 		im += strideMask;
     82 		iy += strideY;
     83 	}
     84 	return y;
     85 }
     86 
     87 
     88 // EXPORTS //
     89 
     90 module.exports = dmskmap;