48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
/**
|
||
* @license Apache-2.0
|
||
*
|
||
* Copyright (c) 2020 The Stdlib Authors.
|
||
*
|
||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
* you may not use this file except in compliance with the License.
|
||
* You may obtain a copy of the License at
|
||
*
|
||
* http://www.apache.org/licenses/LICENSE-2.0
|
||
*
|
||
* Unless required by applicable law or agreed to in writing, software
|
||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
* See the License for the specific language governing permissions and
|
||
* limitations under the License.
|
||
*/
|
||
|
||
#include "stdlib/stats/base/smeankbn2.h"
|
||
#include "stdlib/blas/ext/base/ssumkbn2.h"
|
||
#include <stdint.h>
|
||
|
||
/**
|
||
* Computes the arithmetic mean of a single-precision floating-point strided array using a second-order iterative Kahan–Babuška algorithm.
|
||
*
|
||
* ## Method
|
||
*
|
||
* - This implementation uses a second-order iterative Kahan–Babuška algorithm, as described by Klein (2005).
|
||
*
|
||
* ## References
|
||
*
|
||
* - Klein, Andreas. 2005. "A Generalized Kahan-Babuška-Summation-Algorithm." _Computing_ 76 (3): 279–93. doi:[10.1007/s00607-005-0139-x](https://doi.org/10.1007/s00607-005-0139-x).
|
||
*
|
||
* @param N number of indexed elements
|
||
* @param X input array
|
||
* @param stride stride length
|
||
* @return output value
|
||
*/
|
||
float stdlib_strided_smeankbn2( const int64_t N, const float *X, const int64_t stride ) {
|
||
if ( N <= 0 ) {
|
||
return 0.0 / 0.0; // NaN
|
||
}
|
||
if ( N == 1 || stride == 0 ) {
|
||
return X[ 0 ];
|
||
}
|
||
return (double)stdlib_strided_ssumkbn2( N, X, stride ) / (double)N;
|
||
}
|