smeanors.c (1242B)
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/stats/base/smeanors.h" 20 #include "stdlib/blas/ext/base/ssumors.h" 21 #include <stdint.h> 22 23 /** 24 * Computes the arithmetic mean of a single-precision floating-point strided array using ordinary recursive summation. 25 * 26 * @param N number of indexed elements 27 * @param X input array 28 * @param stride stride length 29 * @return output value 30 */ 31 float stdlib_strided_smeanors( const int64_t N, const float *X, const int64_t stride ) { 32 if ( N <= 0 ) { 33 return 0.0f / 0.0f; // NaN 34 } 35 if ( N == 1 || stride == 0 ) { 36 return X[ 0 ]; 37 } 38 return (double)stdlib_strided_ssumors( N, X, stride ) / (double)N; 39 }