1  /* ----------------------------------------------------------------------
 2   * Project:      CMSIS DSP Library
 3   * Title:        arm_std_f64.c
 4   * Description:  Standard deviation of the elements of a floating-point vector
 5   *
 6   * $Date:        13 September 2021
 7   * $Revision:    V1.10.0
 8   *
 9   * Target Processor: Cortex-M and Cortex-A cores
10   * -------------------------------------------------------------------- */
11  /*
12   * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
13   *
14   * SPDX-License-Identifier: Apache-2.0
15   *
16   * Licensed under the Apache License, Version 2.0 (the License); you may
17   * not use this file except in compliance with the License.
18   * You may obtain a copy of the License at
19   *
20   * www.apache.org/licenses/LICENSE-2.0
21   *
22   * Unless required by applicable law or agreed to in writing, software
23   * distributed under the License is distributed on an AS IS BASIS, WITHOUT
24   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
25   * See the License for the specific language governing permissions and
26   * limitations under the License.
27   */
28  
29  #include "dsp/statistics_functions.h"
30  
31  /**
32    @ingroup groupStats
33   */
34  
35  /**
36    @addtogroup STD
37    @{
38   */
39  
40  /**
41    @brief         Standard deviation of the elements of a floating-point vector.
42    @param[in]     pSrc       points to the input vector
43    @param[in]     blockSize  number of samples in input vector
44    @param[out]    pResult    standard deviation value returned here
45    @return        none
46   */
47  void arm_std_f64(
48    const float64_t * pSrc,
49          uint32_t blockSize,
50          float64_t * pResult)
51  {
52    float64_t var;
53    arm_var_f64(pSrc,blockSize,&var);
54    *pResult = sqrt(var);
55  }
56  
57  /**
58    @} end of STD group
59   */