1 files changed, 71 insertions, 0 deletions
diff --git a/statistics/leastsq.hpp b/statistics/leastsq.hpp
new file mode 100644
index 0000000..fa76fa2
--- /dev/null
+++ b/statistics/leastsq.hpp
@@ -0,0 +1,71 @@
+#ifndef LEAST_SQ_HPP
+#define LeAST_SQ_HPP
+#include <core/fitter.hpp>
+#include <iostream>
+#include <vector>
+#include <cmath>
+using std::cerr;using std::endl;
+
+namespace opt_utilities
+{
+  template<typename Ty,typename Tx,typename Tp,typename Ts,typename Tstr>
+  class leastsq
+    :public statistic<Ty,Tx,Tp,Ts,Tstr>
+  {
+  private:
+    bool verb;
+    int n;
+    
+    
+    statistic<Ty,Tx,Tp,Ts,Tstr>* do_clone()const
+    {
+      // return const_cast<statistic<Ty,Tx,Tp>*>(this);
+      return new leastsq<Ty,Tx,Tp,Ts,Tstr>(*this);
+    }
+  public:
+    void verbose(bool v)
+    {
+      verb=v;
+    }
+  public:
+    leastsq()
+      :verb(false)
+    {}
+    
+    
+
+    Ts do_eval(const Tp& p)
+    {
+      Ts result(0);
+      for(int i=(this->datas()).size()-1;i>=0;--i)
+	{
+	  Ty chi=(this->datas().get_data(i).get_y()-eval_model(this->datas().get_data(i).get_x(),p));
+	  result+=chi*chi;
+
+	}
+      if(verb)
+	{
+	  n++;
+	  if(n%10==0)
+	    {
+
+	      cerr<<result<<"\t";
+	      for(size_t i=0;i<get_size(p);++i)
+		{
+		  cerr<<get_element(p,i)<<",";
+		}
+	      cerr<<endl;
+	    }
+
+	}
+      
+      return result;
+    }
+  };
+  
+}
+
+#endif
+//EOF
+
+