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fvar_a35.cpp
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00001 /*
00002  * $Id: fvar_a35.cpp 1663 2014-02-24 19:48:25Z johnoel $
00003  *
00004  * Author: David Fournier
00005  * Copyright (c) 2008-2012 Regents of the University of California
00006  */
00011 #include "fvar.hpp"
00012 
00013   void DF_dv_dble_diff(void);
00014 
00019 dvar_vector operator-(const dvar_vector& t1, const prevariable& x)
00020   {
00021     RETURN_ARRAYS_INCREMENT();
00022     dvar_vector tmp(t1.indexmin(),t1.indexmax());
00023     save_identifier_string("zcbb");
00024     x.save_prevariable_position();
00025     for (int i=t1.indexmin(); i<=t1.indexmax(); i++)
00026     {
00027       tmp.elem_value(i)=t1.elem_value(i)-value(x);
00028     }
00029     tmp.save_dvar_vector_position();
00030     t1.save_dvar_vector_position();
00031     save_identifier_string("dduu");
00032     RETURN_ARRAYS_DECREMENT();
00033     gradient_structure::GRAD_STACK1->set_gradient_stack(DF_dv_dble_diff);
00034     return(tmp);
00035   }
00036 
00041  void DF_dv_dble_diff(void)
00042  {
00043     verify_identifier_string("dduu");
00044     dvar_vector_position t1_pos=restore_dvar_vector_position();
00045     dvar_vector_position tmp_pos=restore_dvar_vector_position();
00046     prevariable_position xpos=restore_prevariable_position();
00047     dvector dftmp=restore_dvar_vector_derivatives(tmp_pos);
00048     dvector dft1(t1_pos.indexmin(),t1_pos.indexmax());
00049     verify_identifier_string("zcbb");
00050     //double xinv=1./x;
00051     double dfx=0.;
00052     for (int i=t1_pos.indexmax(); i>=t1_pos.indexmin(); i--)
00053     {
00054        // tmp.elem_value(i)=t1.elem_value(i)-value(x);
00055       //tmp.elem_value(i)=value(x)*t1.elem_value(i)/value(x);
00056       dfx-=dftmp(i);
00057       dft1(i)=dftmp(i);
00058     }
00059     save_double_derivative(dfx,xpos);
00060     dft1.save_dvector_derivatives(t1_pos);
00061  }