avg_matrix.js (1400B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 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 matrix = require( './matrix.js' ); 24 25 26 // MAIN // 27 28 /** 29 * Calculate weighted average of two matrices. 30 * 31 * @private 32 * @param {Matrix} A - first matrix 33 * @param {Matrix} B - second matrix 34 * @param {PositiveInteger} weight - relative weight of matrix A 35 * @returns {Matrix} averaged matrix 36 */ 37 function avgMatrix( A, B, weight ) { 38 var propA; 39 var propB; 40 var nrow; 41 var ncol; 42 var val; 43 var C; 44 var i; 45 var j; 46 47 nrow = A.shape[ 0 ]; 48 ncol = A.shape[ 1 ]; 49 C = matrix( [ nrow, ncol ] ); 50 propA = ( weight - 1.0 ) / weight; 51 propB = 1.0 / weight; 52 53 for ( i = 0; i < nrow; i++ ) { 54 for ( j = 0; j < ncol; j++ ) { 55 val = (propA * A.get(i, j)) + (propB * B.get(i, j)); 56 C.set( i, j, val ); 57 } 58 } 59 return C; 60 } 61 62 63 // EXPORTS // 64 65 module.exports = avgMatrix;