From f618466c25d43f3bae9e40920273bf77de1e1149 Mon Sep 17 00:00:00 2001
From: leochanj105 <leochanj@live.unc.edu>
Date: Mon, 19 Oct 2020 23:09:30 -0400
Subject: initial sd-vbs

initial sd-vbs

add sd-vbs

sd-vbs
---
 SD-VBS/benchmarks/localization/src/c/quat2eul.c | 47 +++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 SD-VBS/benchmarks/localization/src/c/quat2eul.c

(limited to 'SD-VBS/benchmarks/localization/src/c/quat2eul.c')

diff --git a/SD-VBS/benchmarks/localization/src/c/quat2eul.c b/SD-VBS/benchmarks/localization/src/c/quat2eul.c
new file mode 100644
index 0000000..bc581c9
--- /dev/null
+++ b/SD-VBS/benchmarks/localization/src/c/quat2eul.c
@@ -0,0 +1,47 @@
+/********************************
+Author: Sravanthi Kota Venkata
+********************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "localization.h"
+#include <math.h>
+
+F2D* quat2eul(F2D* quat)
+{
+    F2D *retEul;
+    int i, j, k;
+    int rows, cols;
+
+    rows = quat->height;
+    cols = quat->width;
+
+    retEul = fSetArray(rows, 3, 0);
+
+    for(i=0; i<rows; i++)
+    {
+        float temp, temp1, temp2, temp3, temp4;
+        float quati2, quati3, quati1, quati0;
+
+        quati0 = subsref(quat,i,0);
+        quati1 = subsref(quat,i,1);
+        quati2 = subsref(quat,i,2);
+        quati3 = subsref(quat,i,3);
+
+        temp = 2 *quati2 * quati3 + quati0 * quati1;
+        temp1 = pow(quati0,2) - pow(quati1,2) - pow(quati2,2) + pow(quati3,2);
+        temp2 = -2*quati1 * quati2 + quati0 * quati3;
+        temp3 = 2*quati1 * quati2 + quati0 * quati3;
+        temp4 = pow(quati0,2) + pow(quati1,2) - pow(quati2,2) - pow(quati3,2);
+        
+        asubsref(retEul,k++) = atan2(temp, temp1);
+        asubsref(retEul,k++) = asin(temp2);
+        asubsref(retEul,k++) = atan2(temp3, temp4);
+    }
+
+    return retEul;
+}
+
+
+
+
-- 
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