From f8a503217845c407f80dc49cccd4043689904106 Mon Sep 17 00:00:00 2001
From: Oliver Sander <sander@igpm.rwth-aachen.de>
Date: Thu, 11 Feb 2010 21:09:46 +0000
Subject: [PATCH] implement gradient of distance function
[[Imported from SVN: r5543]]
---
src/realtuple.hh | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/realtuple.hh b/src/realtuple.hh
index 071c1372..c16fe23a 100644
--- a/src/realtuple.hh
+++ b/src/realtuple.hh
@@ -41,6 +41,12 @@ public:
return (a.data_ - b.data_).two_norm();
}
+ /** \brief Compute the gradient of the distance function keeping the first argument fixed
+ */
+ static EmbeddedTangentVector derivativeOfDistanceWRTSecondArgument(const RealTuple& a, const RealTuple& b) {
+ EmbeddedTangentVector gradient = a.data_ - b.data_;
+ return -gradient/distance(a,b);
+ }
/** \brief Write LocalKey object to output stream */
friend std::ostream& operator<< (std::ostream& s, const RealTuple& realTuple)
--
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