71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
|
|
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_hamming_distance.c
|
|
* Description: Hamming distance between two vectors
|
|
*
|
|
* $Date: 23 April 2021
|
|
* $Revision: V1.9.0
|
|
*
|
|
* Target Processor: Cortex-M and Cortex-A cores
|
|
* -------------------------------------------------------------------- */
|
|
/*
|
|
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*
|
|
* 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
|
|
*
|
|
* 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 "dsp/distance_functions.h"
|
|
#include <limits.h>
|
|
#include <math.h>
|
|
|
|
|
|
extern void arm_boolean_distance_TF_FT(const uint32_t *pA
|
|
, const uint32_t *pB
|
|
, uint32_t numberOfBools
|
|
, uint32_t *cTF
|
|
, uint32_t *cFT
|
|
);
|
|
|
|
/**
|
|
@addtogroup BoolDist
|
|
@{
|
|
*/
|
|
|
|
|
|
/**
|
|
* @brief Hamming distance between two vectors
|
|
*
|
|
* @param[in] pA First vector of packed booleans
|
|
* @param[in] pB Second vector of packed booleans
|
|
* @param[in] numberOfBools Number of booleans
|
|
* @return distance
|
|
*
|
|
*/
|
|
|
|
float32_t arm_hamming_distance(const uint32_t *pA, const uint32_t *pB, uint32_t numberOfBools)
|
|
{
|
|
uint32_t ctf=0,cft=0;
|
|
|
|
arm_boolean_distance_TF_FT(pA, pB, numberOfBools, &ctf, &cft);
|
|
|
|
return(1.0*(ctf + cft) / numberOfBools);
|
|
}
|
|
|
|
|
|
/**
|
|
* @} end of BoolDist group
|
|
*/
|