ndarray.native.js (1706B)
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 Float64Array = require( '@stdlib/array/float64' ); 24 var addon = require( './dapx.native.js' ); 25 26 27 // MAIN // 28 29 /** 30 * Adds a constant to each element in a double-precision floating-point strided array. 31 * 32 * @param {PositiveInteger} N - number of indexed elements 33 * @param {number} alpha - scalar 34 * @param {Float64Array} x - input array 35 * @param {integer} stride - index increment 36 * @param {NonNegativeInteger} offset - starting index 37 * @returns {Float64Array} input array 38 * 39 * @example 40 * var Float64Array = require( '@stdlib/array/float64' ); 41 * 42 * var x = new Float64Array( [ 1.0, -2.0, 3.0, -4.0, 5.0, -6.0 ] ); 43 * var alpha = 5.0; 44 * 45 * dapx( 3, alpha, x, 1, x.length-3 ); 46 * // x => <Float64Array>[ 1.0, -2.0, 3.0, 1.0, 10.0, -1.0 ] 47 */ 48 function dapx( N, alpha, x, stride, offset ) { 49 var view; 50 if ( stride < 0 ) { 51 offset += (N-1) * stride; 52 } 53 view = new Float64Array( x.buffer, x.byteOffset+(x.BYTES_PER_ELEMENT*offset), x.length-offset ); // eslint-disable-line max-len 54 addon( N, alpha, view, stride ); 55 return x; 56 } 57 58 59 // EXPORTS // 60 61 module.exports = dapx;