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/* ----------------------------------------------------------------------
* 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
*/
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