1 files changed, 74 insertions, 0 deletions
diff --git a/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_sokalsneath_distance.c b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_sokalsneath_distance.c
new file mode 100644
index 0000000..93d8e50
--- /dev/null
+++ b/Drivers/CMSIS/DSP/Source/DistanceFunctions/arm_sokalsneath_distance.c
@@ -0,0 +1,74 @@
+
+/* ----------------------------------------------------------------------
+ * Project:      CMSIS DSP Library
+ * Title:        arm_sokalsneath_distance.c
+ * Description:  Sokal-Sneath 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_TT_TF_FT(const uint32_t *pA
+       , const uint32_t *pB
+       , uint32_t numberOfBools
+       , uint32_t *cTT
+       , uint32_t *cTF
+       , uint32_t *cFT
+       );
+
+
+/**
+  @addtogroup BoolDist
+  @{
+ */
+
+/**
+ * @brief        Sokal-Sneath 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_sokalsneath_distance(const uint32_t *pA, const uint32_t *pB, uint32_t numberOfBools)
+{
+    uint32_t ctt=0,cft=0,ctf=0;
+    float32_t r;
+
+    arm_boolean_distance_TT_TF_FT(pA, pB, numberOfBools, &ctt, &ctf, &cft);
+
+    r = 2.0*(ctf + cft);
+
+    return(r / (r + ctt));
+}
+
+
+/**
+ * @} end of BoolDist group
+ */