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Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_cosine_distance_f64.c

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+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_cosine_distance_f64.c
+ * Description:  Cosine distance between two vectors
+ *
+ * $Date:        13 September 2021
+ * $Revision:    V1.10.0
+ *
+ * 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>
+
+
+/**
+  @addtogroup CosineDist
+  @{
+ */
+
+
+
+/**
+ * @brief        Cosine distance between two vectors
+ *
+ * @param[in]    pA         First vector
+ * @param[in]    pB         Second vector
+ * @param[in]    blockSize  vector length
+ * @return distance
+ *
+ */
+
+float64_t arm_cosine_distance_f64(const float64_t *pA,const float64_t *pB, uint32_t blockSize)
+{
+    float64_t pwra,pwrb,dot,tmp;
+
+    arm_power_f64(pA, blockSize, &pwra);
+    arm_power_f64(pB, blockSize, &pwrb);
+
+    arm_dot_prod_f64(pA,pB,blockSize,&dot);
+
+    tmp = sqrt(pwra * pwrb);
+    return(1. - dot / tmp);
+
+}
+
+
+
+/**
+ * @} end of CosineDist group
+ */