internal_compreal.js (1395B)
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 // MAIN // 22 23 /** 24 * Computes the real part of the quotient. 25 * 26 * ## Notes 27 * 28 * - See figure 10 of [reference][@baudin:2012]. 29 * 30 * [@baudin:2012]: https://arxiv.org/abs/1210.4539 31 * 32 * @private 33 * @param {number} re1 - real component 34 * @param {number} im1 - imaginary component 35 * @param {number} re2 - real component 36 * @param {number} im2 - imaginary component 37 * @param {number} r - partial result 38 * @param {number} t - partial result 39 * @returns {number} real part of the quotient 40 */ 41 function internalCompreal( re1, im1, re2, im2, r, t ) { 42 var br; 43 if ( r === 0.0 ) { 44 return ( re1 + (im2 * (im1/re2)) ) * t; 45 } 46 br = im1 * r; 47 if ( br === 0.0 ) { 48 return ( re1*t ) + ( (im1*t) * r ); 49 } 50 return ( re1+br ) * t; 51 } 52 53 54 // EXPORTS // 55 56 module.exports = internalCompreal;