git-svn-id: file:///home/svn/opt_utilities@1 ed2142bd-67ad-457f-ba7c-d818d4011675

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diff --git a/models/nbeta1d.hpp b/models/nbeta1d.hpp
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+#ifndef NBETA_MODEL_H_
+#define NBETA_MODEL_H_
+#include <core/fitter.hpp>
+#include <cmath>
+#include <iostream>
+namespace opt_utilities
+{
+  template <typename T>
+  class nbeta1d
+    :public model<T,T,std::vector<T> ,std::string>
+  {
+  private:
+    model<T,T,std::vector<T> >* do_clone()const
+    {
+      return new nbeta1d<T>(*this);
+    }
+  public:
+    nbeta1d()
+    {
+      this->push_param_info(param_info<std::vector<T> >("S0",1));
+      this->push_param_info(param_info<std::vector<T> >("rc",10));
+      this->push_param_info(param_info<std::vector<T> >("beta",2./3.));
+      this->push_param_info(param_info<std::vector<T> >("bkg",0));
+    }
+
+
+    T do_eval(const T& x,const std::vector<T>& param)
+    {
+      T S0=get_element(param,0);
+      T r_c=get_element(param,1);
+      T beta=get_element(param,2);
+      T bkg=get_element(param,3);
+
+      return bkg+S0*pow(1+(x*x)/(r_c*r_c),-3./2.*beta);
+    }
+    
+  private:
+    std::string do_to_string()const
+    {
+      return "density beta model\n"
+	"n=n0*(1+(r/rc)^2)^(-1.5*beta)\n";
+    }
+  };
+};
+
+
+
+#endif
+//EOF