1 files changed, 56 insertions, 0 deletions
diff --git a/models/bpl1d.hpp b/models/bpl1d.hpp
new file mode 100644
index 0000000..faf1336
--- /dev/null
+++ b/models/bpl1d.hpp
@@ -0,0 +1,56 @@
+#ifndef BROKEN_POWER_LAW_MODEL_H_
+#define BROKEN_POWER_LAW_MODEL_H_
+#include <core/fitter.hpp>
+#include <cmath>
+
+namespace opt_utilities
+{
+  template <typename T>
+  class bpl1d
+    :public model<T,T,std::vector<T>,std::string>
+  {
+  private:
+    model<T,T,std::vector<T> >* do_clone()const
+    {
+      return new bpl1d<T>(*this);
+    }
+  public:
+    bpl1d()
+    {
+      this->push_param_info(param_info<std::vector<T> >("bpx",1));
+      this->push_param_info(param_info<std::vector<T> >("bpy",1));
+      this->push_param_info(param_info<std::vector<T> >("gamma1",1));
+      this->push_param_info(param_info<std::vector<T> >("gamma2",1));
+    }
+
+    T do_eval(const T& x,const std::vector<T>& param)
+    {
+      T x_b=get_element(param,0);
+      T f_b=get_element(param,1);
+      T gamma1=get_element(param,2);
+      T gamma2=get_element(param,3);
+      if(x<x_b)
+	{
+	  return f_b*pow(x,gamma1)/pow(x_b,gamma1);
+	}
+      else
+	{
+	  return f_b*pow(x,gamma2)/pow(x_b,gamma2);
+	}
+    }
+
+
+  private:
+    std::string do_to_string()const
+    {
+      return "broken power law\n"
+	"y=y_b*(x/x_b)^gamma1 for x<x_b\n"
+	"y=y_b*(x/x_b)^gamma2 otherwise\n";
+    }
+  };
+};
+
+
+
+#endif
+//EOF