| /* ---------------------------------------------------------------------- | |
| * 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. | |
| */ | |
| 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 | |
| */ | |