reim.js (1536B)
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 Float64Array = require( '@stdlib/array/float64' ); 24 var Float32Array = require( '@stdlib/array/float32' ); 25 26 27 // MAIN // 28 29 /** 30 * Returns the real and imaginary components of a complex number. 31 * 32 * @param {Complex} z - complex number 33 * @returns {(Float64Array|Float32Array)} real and imaginary components 34 * 35 * @example 36 * var Complex128 = require( '@stdlib/complex/float64' ); 37 * 38 * var z = new Complex128( 5.0, 3.0 ); 39 * 40 * var out = reim( z ); 41 * // returns <Float64Array>[ 5.0, 3.0 ] 42 * 43 * @example 44 * var Complex64 = require( '@stdlib/complex/float32' ); 45 * 46 * var z = new Complex64( 5.0, 3.0 ); 47 * 48 * var out = reim( z ); 49 * // returns <Float32Array>[ 5.0, 3.0 ] 50 */ 51 function reim( z ) { 52 var out; 53 if ( z.BYTES_PER_ELEMENT === 4 ) { 54 out = new Float32Array( 2 ); 55 } else { 56 out = new Float64Array( 2 ); 57 } 58 out[ 0 ] = z.re; 59 out[ 1 ] = z.im; 60 return out; 61 } 62 63 64 // EXPORTS // 65 66 module.exports = reim;