From 834437d870a41460c5f2fdcfd6c84794af8bbdb6 Mon Sep 17 00:00:00 2001
From: jiri <jiri>
Date: Thu, 8 Sep 2005 10:23:45 +0000
Subject: [PATCH] *** empty log message ***

---
 permutation.h | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 permutation.h

diff --git a/permutation.h b/permutation.h
new file mode 100644
index 0000000..34c9934
--- /dev/null
+++ b/permutation.h
@@ -0,0 +1,9 @@
+template<typename T>
+const NRVec<T> inversepermutation(const NRVec<T> &p, const T offset=0)
+{
+int n=p.size();
+NRVec<T> q(n);
+if(!offset) for(int i=0; i<n; ++i) q[p[i]]=i;
+else for(int i=0; i<n; ++i) q[p[i]-offset]=i+offset;
+return q;
+}