--- trunk/OOPSE/libmdtools/Utility.cpp	2004/02/07 00:16:47	1039
+++ trunk/OOPSE/libmdtools/Utility.cpp	2004/05/12 21:54:14	1175
@@ -1,26 +1,24 @@
-#include "Utility.hpp"
-#include <vector>
-#include <iostream>
-#include <math.h>
-using namespace std;
-
-double dotProduct(vector<double>& v1, vector<double>& v2){
-  double sum;
-
-  sum = 0;
-
-  if(v1.size() != v2.size()){
-    cerr << "Utility Error: dimension of two vectors are not matched" << endl;
-    exit(-1);
-  }
-  
-   for(int  i = 0; i < v1.size(); i++)
-     sum += v1[i]*v2[i];
-   return sum;
-}
-
-double copysign(double sign, double value){
-  double result = fabs(value);
-
-  return sign >= 0 ? result : -result;
-}
+#include "Utility.hpp"
+#include <vector>
+#include <iostream>
+#include <math.h>
+using namespace std;
+
+double dotProduct(vector<double>& v1, vector<double>& v2){
+  double sum;
+
+  sum = 0;
+
+  if(v1.size() != v2.size()){
+    cerr << "Utility Error: dimension of two vectors are not matched" << endl;
+    exit(-1);
+  }
+  
+   for(int  i = 0; i < v1.size(); i++)
+     sum += v1[i]*v2[i];
+   return sum;
+}
+
+double norm2(vector<double>& x){
+  return sqrt(dotProduct(x, x));
+}