dsnannsumors.c (1689B)
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 #include "stdlib/blas/ext/base/dsnannsumors.h" 20 #include "stdlib/math/base/assert/is_nanf.h" 21 #include <stdint.h> 22 23 /** 24 * 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. 25 * 26 * @param N number of indexed elements 27 * @param X input array 28 * @param stride stride length 29 * @param n pointer for storing the number of non-NaN elements 30 * @return output value 31 */ 32 double stdlib_strided_dsnannsumors( const int64_t N, const float *X, const int64_t stride, int64_t *n ) { 33 double sum; 34 int64_t ix; 35 int64_t i; 36 37 sum = 0.0; 38 *n = 0; 39 if ( N <= 0 ) { 40 return sum; 41 } 42 if ( N == 1 || stride == 0 ) { 43 if ( stdlib_base_is_nanf( X[ 0 ] ) ) { 44 return sum; 45 } 46 *n += 1; 47 return X[ 0 ]; 48 } 49 if ( stride < 0 ) { 50 ix = (1-N) * stride; 51 } else { 52 ix = 0; 53 } 54 for ( i = 0; i < N; i++ ) { 55 if ( !stdlib_base_is_nanf( X[ ix ] ) ) { 56 sum += (double)X[ ix ]; 57 *n += 1; 58 } 59 ix += stride; 60 } 61 return sum; 62 }