cpu/CFieldComparison.tpp

#ifndef PRDC_CPU_C_FIELD_COMPARISON_TPP
#define PRDC_CPU_C_FIELD_COMPARISON_TPP
 
/*
* PSCF - Polymer Self-Consistent Field
*
* Copyright 2015 - 2025, The Regents of the University of Minnesota
* Distributed under the terms of the GNU General Public License.
*/
 
#include "CFieldComparison.h"
#include <prdc/cpu/CField.h>
#include <util/containers/DArray.h>
#include <cmath>
 
namespace Pscf {
namespace Prdc {
namespace Cpu {
 
   /*
   * Default constructor.
   */
   template <int D>
   CFieldComparison<D>::CFieldComparison()
    : maxDiff_(0.0),
      rmsDiff_(0.0)
   {};
 
   /*
   * Comparator for individual fields.
   */
   template <int D>
   double
   CFieldComparison<D>::compare(CField<D> const& a, CField<D> const& b)
   {
      UTIL_CHECK(a.capacity() > 0);
      UTIL_CHECK(a.capacity() == b.capacity());
      int n = a.capacity();
      double diffSq, diff, d0, d1;
      maxDiff_ = 0.0;
      rmsDiff_ = 0.0;
      for (int i = 0; i < n; ++i) {
         d0 = a[i][0] - b[i][0];
         d1 = a[i][1] - b[i][1];
         diffSq = d0*d0 + d1*d1;
         diff = sqrt(diffSq);
         if (std::isnan(diff)) {
            // If either field has a NaN component, set error to very
            // high value and exit the function
            maxDiff_ = 1e8;
            rmsDiff_ = 1e8;
            return maxDiff_;
         } else if (diff > maxDiff_) {
            maxDiff_ = diff;
         }
         rmsDiff_ += diffSq;
         //std::cout << i
         //          << " " << a[i][0]  << " " << a[i][1]
         //          << " " << b[i][0]  << " " << b[i][1]
         //          << " " << diff << std::endl;
      }
      rmsDiff_ = rmsDiff_/double(n);
      rmsDiff_ = sqrt(rmsDiff_);
      return maxDiff_;
   }
 
   /*
   * Comparator for arrays of fields.
   */
   template <int D>
   double CFieldComparison<D>::compare(DArray< CField<D> > const & a,
                                       DArray< CField<D> > const & b)
   {
      UTIL_CHECK(a.capacity() > 0);
      UTIL_CHECK(a.capacity() == b.capacity());
      UTIL_CHECK(a[0].capacity() > 0);
      int m = a.capacity();
      double diffSq, diff, d0, d1;
      maxDiff_ = 0.0;
      rmsDiff_ = 0.0;
      int i, j, n;
      for (i = 0; i < m; ++i) {
         n = a[i].capacity();
         UTIL_CHECK(n > 0);
         UTIL_CHECK(n == b[i].capacity());
         for (j = 0; j < n; ++j) {
            d0 = a[i][j][0] - b[i][j][0];
            d1 = a[i][j][1] - b[i][j][1];
            diffSq = d0*d0 + d1*d1;
            diff = sqrt(diffSq);
            if (std::isnan(diff)) {
               // If either field has a NaN component, set error to very
               // high value and exit the function
               maxDiff_ = 1e8;
               rmsDiff_ = 1e8;
               return maxDiff_;
            } else if (diff > maxDiff_) {
               maxDiff_ = diff;
            }
            rmsDiff_ += diffSq;
         }
      }
      rmsDiff_ = rmsDiff_/double(m*n);
      rmsDiff_ = sqrt(rmsDiff_);
      return maxDiff_;
   }
 
}
}
}
#endif