From abcaca09e68e61062b2bf860c6d3328923869234 Mon Sep 17 00:00:00 2001
From: astrojhgu <astrojhgu@ed2142bd-67ad-457f-ba7c-d818d4011675>
Date: Fri, 4 Jun 2010 08:34:16 +0000
Subject: c

git-svn-id: file:///home/svn/opt_utilities@119 ed2142bd-67ad-457f-ba7c-d818d4011675
---
 core/num_diff.hpp | 115 ------------------------------------------------------
 1 file changed, 115 deletions(-)
 delete mode 100644 core/num_diff.hpp

(limited to 'core')

diff --git a/core/num_diff.hpp b/core/num_diff.hpp
deleted file mode 100644
index 27a1674..0000000
--- a/core/num_diff.hpp
+++ /dev/null
@@ -1,115 +0,0 @@
-/**
-   \file num_diff.hpp
- */
-
-
-#ifndef NUMDIFF_HPP
-#define NUMDIFF_HPP
-#define OPT_HEADER
-#include <core/optimizer.hpp>
-#include <core/opt_traits.hpp>
-#include <algorithm>
-#include <limits>
-#include <cmath>
-
-namespace opt_utilities
-{
-
-  /**
-     \brief differentiable function
-     \tparam rT the return type
-     \tparam the parameter type
-   */
-  template <typename rT,typename pT>
-  class dfunc_obj
-    :public func_obj<rT,pT>
-  {
-  private:
-    virtual pT do_diff(const pT& p)=0;
-    
-  public:
-    /**
-       calculate the differentiation
-       \param p the self-var
-       \return the gradient at p
-     */
-    pT diff(const pT& p)
-    {
-      return do_diff(p);
-    }
-  };
-  
-
-  /**
-     When trying to diff an object function, when it is not differentiable,
-     this exception will be thrown.
-   */
-  class underivable
-    :public opt_exception
-  {
-  public:
-    underivable()
-      :opt_exception("underivable")
-    {}
-  };
-
-  /**
-     calculate the numerical differential of a func_obj
-   */
-  template <typename rT,typename pT>
-    pT numdiff(func_obj<rT,pT>& f,const pT& p)
-  {
-    rT ep=std::sqrt(std::numeric_limits<rT>::epsilon());
-    
-    pT result;
-    resize(result,get_size(p));
-    pT p2;
-    resize(p2,get_size(p));
-    pT p1;
-    resize(p1,get_size(p));
-    
-    for(size_t i=0;i<get_size(p);++i)
-      {
-	set_element(p2,i,get_element(p,i));
-	set_element(p1,i,get_element(p,i));
-      }
-    for(size_t i=0;i<get_size(p);++i)
-      {
-	typename element_type_trait<pT>::element_type h=
-	  std::max(get_element(p,i),rT(1))*ep;
-	  
-	set_element(p2,i,get_element(p,i)+h);
-	set_element(p1,i,get_element(p,i)-h);
-	
-	rT v2=f(p2);
-	rT v1=f(p1);
-	set_element(result,i,
-		    (v2-v1)/h/2
-		    );
-	set_element(p2,i,get_element(p,i));
-	set_element(p1,i,get_element(p,i));
-      }
-    return result;
-  }
-
-
-  /**
-     Help function to calculate the gradient of an objection function 
-     func_obj, whether it is differentiable or not. If it is differentiable, 
-     the gradient will be calculated by calling the diff member in the func_obj,
-     or a numerical calculation will be performed.
-   */
-  template <typename rT,typename pT>
-    pT diff(func_obj<rT,pT>& f,const pT& p)
-  {
-    dfunc_obj<rT,pT>* pdf=dynamic_cast<dfunc_obj<rT,pT>*>(&f);
-    if(pdf)
-      {
-	return pdf->diff(p);
-      }
-    return numdiff(f,p);
-    
-  }
-}
-
-#endif
-- 
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