1 files changed, 73 insertions, 0 deletions
diff --git a/models/beta2d2.hpp b/models/beta2d2.hpp
new file mode 100644
index 0000000..bb473a3
--- /dev/null
+++ b/models/beta2d2.hpp
@@ -0,0 +1,73 @@
+#ifndef BETA_MODEL2d2_H_
+#define BETA_MODEL2d2_H_
+#include <core/fitter.hpp>
+#include <cmath>
+#include <cassert>
+#include "vecn.hpp"
+
+
+namespace opt_utilities
+{
+  
+  template <typename T>
+  class beta2d2
+    :public model<T,vecn<T,2>,std::vector<T>,std::string>
+  {
+  private:
+    model<T,vecn<T,2>,std::vector<T> >* do_clone()const
+    {
+      return new beta2d2<T>(*this);
+    }
+  public:
+    beta2d2()
+    {
+      this->push_param_info(param_info<std::vector<T> >("r0",20));
+      this->push_param_info(param_info<std::vector<T> >("x0",100));
+      this->push_param_info(param_info<std::vector<T> >("y0",100));
+      this->push_param_info(param_info<std::vector<T> >("epsilon",0));
+      this->push_param_info(param_info<std::vector<T> >("theta",100));
+      this->push_param_info(param_info<std::vector<T> >("ampl",3));
+      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 vecn<T,2>& xy,const std::vector<T>& param)
+    {
+      T x=xy[0];
+      T y=xy[1];
+
+      T r0=get_element(param,0);
+      T x0=get_element(param,1);
+      T y0=get_element(param,2);
+      T epsilon=get_element(param,3);
+      T theta=get_element(param,4);
+      T ampl=get_element(param,5);
+      T beta=get_element(param,6);
+      T bkg=get_element(param,7);
+
+      T x_new=(x-x0)*cos(theta)+(y-y0)*sin(theta);
+      T y_new=(y-y0)*cos(theta)-(x-x0)*sin(theta);
+      
+      //T _epsilon=sin(epsilon)-0.00001;
+      
+      T _epsilon=epsilon;
+
+      //      T r=sqrt(x_new*x_new*(1-_epsilon)*(1-_epsilon)
+      //	       + y_new*y_new);
+      
+      //r/=(1-_epsilon);
+      T r_r=x_new*x_new/exp(_epsilon)+y_new*y_new/exp(-_epsilon);
+      
+      
+      return bkg+ampl*pow(1+r_r/r0/r0,-3*beta+static_cast<T>(.5));
+    }
+
+
+  };
+};
+
+
+
+#endif
+//EOF