outer.js (1289B)
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 array = require( '@stdlib/ndarray/array' ); 24 var Float64Array = require( '@stdlib/array/float64' ); 25 26 27 // MAIN // 28 29 /** 30 * Computes the outer product. 31 * 32 * @param {Float64Array} x - first factor of outer product 33 * @param {Float64Array} y - second factor of outer product 34 * @returns {Matrix} output matrix 35 */ 36 function outer( x, y ) { 37 var xlen = x.length; 38 var ylen = y.length; 39 var out = array( new Float64Array( xlen * ylen ), { 40 'shape': [ xlen, ylen ] 41 }); 42 var i; 43 var j; 44 for ( i = 0; i < xlen; i++ ) { 45 for ( j = 0; j < ylen; j++ ) { 46 out.set( i, j, x[ i ] * y[ j ] ); 47 } 48 } 49 return out; 50 } 51 52 53 // EXPORTS // 54 55 module.exports = outer;