dsnannsumors.js (2286B)
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 isnan = require( '@stdlib/math/base/assert/is-nan' ); 24 25 26 // MAIN // 27 28 /** 29 * Computes the sum of single-precision floating-point strided array elements, ignoring `NaN` values, using ordinary recursive summation with extended accumulation, and returning an extended precision result. 30 * 31 * @param {PositiveInteger} N - number of indexed elements 32 * @param {Float32Array} x - input array 33 * @param {integer} strideX - `x` stride length 34 * @param {Float64Array} out - output array 35 * @param {integer} strideOut - `out` stride length 36 * @returns {Float64Array} output array 37 * 38 * @example 39 * var Float32Array = require( '@stdlib/array/float32' ); 40 * var Float64Array = require( '@stdlib/array/float64' ); 41 * 42 * var x = new Float32Array( [ 1.0, -2.0, NaN, 2.0 ] ); 43 * var out = new Float64Array( 2 ); 44 * 45 * var v = dsnannsumors( x.length, x, 1, out, 1 ); 46 * // returns <Float64Array>[ 1.0, 3 ] 47 */ 48 function dsnannsumors( N, x, strideX, out, strideOut ) { 49 var sum; 50 var ix; 51 var io; 52 var n; 53 var i; 54 55 if ( strideX < 0 ) { 56 ix = (1-N) * strideX; 57 } else { 58 ix = 0; 59 } 60 if ( strideOut < 0 ) { 61 io = -strideOut; 62 } else { 63 io = 0; 64 } 65 sum = 0.0; 66 if ( N <= 0 ) { 67 out[ io ] = sum; 68 out[ io+strideOut ] = 0; 69 return out; 70 } 71 if ( N === 1 || strideX === 0 ) { 72 if ( isnan( x[ ix ] ) ) { 73 out[ io ] = sum; 74 out[ io+strideOut ] = 0; 75 return out; 76 } 77 out[ io ] = x[ ix ]; 78 out[ io+strideOut ] = 1; 79 return out; 80 } 81 n = 0; 82 for ( i = 0; i < N; i++ ) { 83 if ( isnan( x[ ix ] ) === false ) { 84 sum += x[ ix ]; 85 n += 1; 86 } 87 ix += strideX; 88 } 89 out[ io ] = sum; 90 out[ io+strideOut ] = n; 91 return out; 92 } 93 94 95 // EXPORTS // 96 97 module.exports = dsnannsumors;