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2005-09-08 10:23:45 +00:00 · 2005-09-08 10:23:45 +00:00 · 834437d870
parent aa4fc240e0
commit 834437d870
1 changed files with 9 additions and 0 deletions
--- a/permutation.h
+++ 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;
+}