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71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_hamming_distance.c
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* Description: Hamming distance between two vectors
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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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/distance_functions.h"
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#include <limits.h>
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#include <math.h>
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extern void arm_boolean_distance_TF_FT(const uint32_t *pA
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, const uint32_t *pB
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, uint32_t numberOfBools
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, uint32_t *cTF
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, uint32_t *cFT
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);
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/**
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@addtogroup BoolDist
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@{
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*/
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/**
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* @brief Hamming distance between two vectors
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*
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* @param[in] pA First vector of packed booleans
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* @param[in] pB Second vector of packed booleans
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* @param[in] numberOfBools Number of booleans
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* @return distance
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*
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*/
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float32_t arm_hamming_distance(const uint32_t *pA, const uint32_t *pB, uint32_t numberOfBools)
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{
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uint32_t ctf=0,cft=0;
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arm_boolean_distance_TF_FT(pA, pB, numberOfBools, &ctf, &cft);
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return(1.0*(ctf + cft) / numberOfBools);
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}
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/**
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* @} end of BoolDist group
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*/
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