Line data    Source code

       1             : /* +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
       2             :    Copyright (c) 2013-2018 The plumed team
       3             :    (see the PEOPLE file at the root of the distribution for a list of names)
       4             : 
       5             :    See http://www.plumed.org for more information.
       6             : 
       7             :    This file is part of plumed, version 2.
       8             : 
       9             :    plumed is free software: you can redistribute it and/or modify
      10             :    it under the terms of the GNU Lesser General Public License as published by
      11             :    the Free Software Foundation, either version 3 of the License, or
      12             :    (at your option) any later version.
      13             : 
      14             :    plumed is distributed in the hope that it will be useful,
      15             :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      17             :    GNU Lesser General Public License for more details.
      18             : 
      19             :    You should have received a copy of the GNU Lesser General Public License
      20             :    along with plumed.  If not, see <http://www.gnu.org/licenses/>.
      21             : +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ */
      22             : #include "VesselRegister.h"
      23             : #include "FunctionVessel.h"
      24             : #include "ActionWithVessel.h"
      25             : 
      26             : namespace PLMD {
      27             : namespace vesselbase {
      28             : 
      29           4 : class Min : public FunctionVessel {
      30             : private:
      31             :   double beta;
      32             : public:
      33             :   static void registerKeywords( Keywords& keys );
      34             :   static void reserveKeyword( Keywords& keys );
      35             :   explicit Min( const VesselOptions& da );
      36             :   std::string value_descriptor();
      37             :   double calcTransform( const double& val, double& dv ) const ;
      38             :   double finalTransform( const double& val, double& dv );
      39             : };
      40             : 
      41        2525 : PLUMED_REGISTER_VESSEL(Min,"MIN")
      42             : 
      43           2 : void Min::registerKeywords( Keywords& keys ) {
      44           2 :   FunctionVessel::registerKeywords( keys );
      45           2 :   keys.add("compulsory","BETA","the value of beta for the equation in the manual");
      46           2 : }
      47             : 
      48         841 : void Min::reserveKeyword( Keywords& keys ) {
      49             :   keys.reserve("vessel","MIN","calculate the minimum value. "
      50             :                "To make this quantity continuous the minimum is calculated using "
      51             :                "\\f$ \\textrm{min} = \\frac{\\beta}{ \\log \\sum_i \\exp\\left( \\frac{\\beta}{s_i} \\right) } \\f$ "
      52         841 :                "The value of \\f$\\beta\\f$ in this function is specified using (BETA=\\f$\\beta\\f$)");
      53             :   keys.addOutputComponent("min","MIN","the minimum value. This is calculated using the formula described in the description of the "
      54         841 :                           "keyword so as to make it continuous.");
      55         841 : }
      56             : 
      57           2 : Min::Min( const VesselOptions& da ) :
      58           2 :   FunctionVessel(da)
      59             : {
      60           2 :   if( getAction()->isPeriodic() ) error("min is not a meaningful option for periodic variables");
      61           2 :   parse("BETA",beta);
      62             : 
      63           2 :   if( diffweight ) error("can't calculate min if weight is differentiable");
      64           2 : }
      65             : 
      66           2 : std::string Min::value_descriptor() {
      67           2 :   std::string str_beta; Tools::convert( beta, str_beta );
      68           2 :   return "the minimum value. Beta is equal to " + str_beta;
      69             : }
      70             : 
      71          10 : double Min::calcTransform( const double& val, double& dv ) const {
      72          10 :   double f = exp(beta/val); dv=f/(val*val);
      73          10 :   return f;
      74             : }
      75             : 
      76           5 : double Min::finalTransform( const double& val, double& dv ) {
      77           5 :   double dist=beta/std::log( val );
      78           5 :   dv = dist*dist/val; return dist;
      79             : }
      80             : 
      81             : }
      82        2523 : }