From 55969fb2979ea6ca662144e09f440120f01f9834 Mon Sep 17 00:00:00 2001
From: Oliver Sander <sander@igpm.rwth-aachen.de>
Date: Wed, 10 Feb 2010 21:41:14 +0000
Subject: [PATCH] implement the Riemannian distance
[[Imported from SVN: r5530]]
---
src/unitvector.hh | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/unitvector.hh b/src/unitvector.hh
index e2fbdf17..200dfd48 100644
--- a/src/unitvector.hh
+++ b/src/unitvector.hh
@@ -18,6 +18,11 @@ public:
return *this;
}
+ /** \brief Length of the great arc connecting the two points */
+ static double distance(const UnitVector& a, const UnitVector& b) {
+ return std::acos(a.data_ * b.data_);
+ }
+
/** \brief Write LocalKey object to output stream */
friend std::ostream& operator<< (std::ostream& s, const UnitVector& unitVector)
{
--
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