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95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_power_f64.c
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* Description: Sum of the squares of the elements of a floating-point vector
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*
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* $Date: 13 September 2021
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* $Revision: V1.10.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dsp/statistics_functions.h"
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/**
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@ingroup groupStats
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*/
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/**
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@defgroup power Power
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Calculates the sum of the squares of the elements in the input vector.
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The underlying algorithm is used:
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<pre>
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Result = pSrc[0] * pSrc[0] + pSrc[1] * pSrc[1] + pSrc[2] * pSrc[2] + ... + pSrc[blockSize-1] * pSrc[blockSize-1];
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</pre>
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There are separate functions for floating point, Q31, Q15, and Q7 data types.
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Since the result is not divided by the length, those functions are in fact computing
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something which is more an energy than a power.
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*/
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/**
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@addtogroup power
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@{
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*/
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/**
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@brief Sum of the squares of the elements of a floating-point vector.
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@param[in] pSrc points to the input vector
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@param[in] blockSize number of samples in input vector
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@param[out] pResult sum of the squares value returned here
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@return none
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*/
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void arm_power_f64(
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const float64_t * pSrc,
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uint32_t blockSize,
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float64_t * pResult)
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{
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uint32_t blkCnt; /* Loop counter */
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float64_t sum = 0.0f; /* Temporary result storage */
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float64_t in; /* Temporary variable to store input value */
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/* Initialize blkCnt with number of samples */
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blkCnt = blockSize;
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while (blkCnt > 0U)
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{
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/* C = A[0] * A[0] + A[1] * A[1] + ... + A[blockSize-1] * A[blockSize-1] */
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/* Compute Power and store result in a temporary variable, sum. */
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in = *pSrc++;
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sum += in * in;
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/* Decrement loop counter */
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blkCnt--;
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}
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/* Store result to destination */
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*pResult = sum;
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}
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/**
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@} end of power group
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*/
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