dmeanstdevpn.c (1468B)
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/dmeanstdevpn.h" 20 #include "stdlib/stats/base/dmeanvarpn.h" 21 #include <stdint.h> 22 #include <math.h> 23 24 /** 25 * Computes the mean and standard deviation of a double-precision floating-point strided array using a two-pass algorithm. 26 * 27 * @param N number of indexed elements 28 * @param correction degrees of freedom adjustment 29 * @param X input array 30 * @param strideX X stride length 31 * @param Out output array 32 * @param strideOut Out stride length 33 */ 34 void stdlib_strided_dmeanstdevpn( const int64_t N, const double correction, const double *X, const int64_t strideX, double *Out, const int64_t strideOut ) { 35 int64_t io; 36 37 stdlib_strided_dmeanvarpn( N, correction, X, strideX, Out, strideOut ); 38 if ( strideOut < 0 ) { 39 io = 0; 40 } else { 41 io = strideOut; 42 } 43 Out[ io ] = sqrt( Out[ io ] ); 44 return; 45 }