From 79f7acd1abbceda35610914ca12694b8471cc8f9 Mon Sep 17 00:00:00 2001
From: Oliver Sander <sander@igpm.rwth-aachen.de>
Date: Wed, 16 Nov 2011 14:09:56 +0000
Subject: [PATCH] copy the remaining code of fdcheck.hh into fdcheck.cc
[[Imported from SVN: r8196]]
---
test/fdcheck.cc | 478 ++++++++++++++++++++++++++++++++++++++++++++++-
test/fdcheck.hh | 484 ------------------------------------------------
2 files changed, 475 insertions(+), 487 deletions(-)
delete mode 100644 test/fdcheck.hh
diff --git a/test/fdcheck.cc b/test/fdcheck.cc
index 805e5fdd..443eda39 100644
--- a/test/fdcheck.cc
+++ b/test/fdcheck.cc
@@ -5,17 +5,489 @@
#include <dune/istl/io.hh>
#include <dune/gfe/rigidbodymotion.hh>
-#include <dune/gfe/quaternion.hh>
#include <dune/gfe/rodassembler.hh>
-#include "fdcheck.hh"
-
// Number of degrees of freedom:
// 7 (x, y, z, q_1, q_2, q_3, q_4) for a spatial rod
const int blocksize = 6;
using namespace Dune;
+void infinitesimalVariation(RigidBodyMotion<double,3>& c, double eps, int i)
+{
+ if (i<3)
+ c.r[i] += eps;
+ else {
+ Dune::FieldVector<double,3> axial(0);
+ axial[i-3] = eps;
+ SkewMatrix<double,3> variation(axial);
+ c.q = c.q.mult(Rotation<double,3>::exp(variation));
+ }
+}
+
+template <class GridType>
+void strainFD(const std::vector<RigidBodyMotion<double,3> >& x,
+ double pos,
+ Dune::array<Dune::FieldMatrix<double,2,6>, 6>& fdStrainDerivatives,
+ const RodAssembler<GridType,3>& assembler)
+{
+ assert(x.size()==2);
+ double eps = 1e-8;
+
+ typename GridType::template Codim<0>::EntityPointer element = assembler.grid_->template leafbegin<0>();
+
+ // ///////////////////////////////////////////////////////////
+ // Compute gradient by finite-difference approximation
+ // ///////////////////////////////////////////////////////////
+ std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
+
+ for (size_t i=0; i<x.size(); i++) {
+
+ Dune::FieldVector<double,6> fdGradient;
+
+ for (int j=0; j<6; j++) {
+
+ infinitesimalVariation(forwardSolution[i], eps, j);
+ infinitesimalVariation(backwardSolution[i], -eps, j);
+
+// fdGradient[j] = (assembler.computeEnergy(forwardSolution) - assembler.computeEnergy(backwardSolution))
+// / (2*eps);
+ Dune::FieldVector<double,6> strain;
+ strain = assembler.getStrain(forwardSolution, element, pos);
+ strain -= assembler.getStrain(backwardSolution, element, pos);
+ strain /= 2*eps;
+
+ for (int m=0; m<6; m++)
+ fdStrainDerivatives[m][i][j] = strain[m];
+
+ forwardSolution[i] = x[i];
+ backwardSolution[i] = x[i];
+ }
+
+ }
+
+}
+
+
+template <class GridType>
+void strain2ndOrderFD(const std::vector<RigidBodyMotion<double,3> >& x,
+ double pos,
+ Dune::array<Dune::Matrix<Dune::FieldMatrix<double,6,6> >, 3>& translationDer,
+ Dune::array<Dune::Matrix<Dune::FieldMatrix<double,3,3> >, 3>& rotationDer,
+ const RodAssembler<GridType,3>& assembler)
+{
+ assert(x.size()==2);
+ double eps = 1e-3;
+
+ typename GridType::template Codim<0>::EntityPointer element = assembler.grid_->template leafbegin<0>();
+
+ for (int m=0; m<3; m++) {
+
+ translationDer[m].setSize(2,2);
+ translationDer[m] = 0;
+
+ rotationDer[m].setSize(2,2);
+ rotationDer[m] = 0;
+
+ }
+
+ // ///////////////////////////////////////////////////////////
+ // Compute gradient by finite-difference approximation
+ // ///////////////////////////////////////////////////////////
+ std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
+
+ std::vector<RigidBodyMotion<double,3> > forwardForwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > forwardBackwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardForwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardBackwardSolution = x;
+
+ for (int i=0; i<2; i++) {
+
+ for (int j=0; j<3; j++) {
+
+ for (int k=0; k<2; k++) {
+
+ for (int l=0; l<3; l++) {
+
+ if (i==k && j==l) {
+
+ infinitesimalVariation(forwardSolution[i], eps, j+3);
+ infinitesimalVariation(backwardSolution[i], -eps, j+3);
+
+ // Second derivative
+// fdHessian[j][k] = (assembler.computeEnergy(forwardSolution)
+// - 2*assembler.computeEnergy(x)
+// + assembler.computeEnergy(backwardSolution)) / (eps*eps);
+
+ Dune::FieldVector<double,6> strain;
+ strain = assembler.getStrain(forwardSolution, element, pos);
+ strain += assembler.getStrain(backwardSolution, element, pos);
+ strain.axpy(-2, assembler.getStrain(x, element, pos));
+ strain /= eps*eps;
+
+ for (int m=0; m<3; m++)
+ rotationDer[m][i][k][j][l] = strain[3+m];
+
+ forwardSolution = x;
+ backwardSolution = x;
+
+ } else {
+
+ infinitesimalVariation(forwardForwardSolution[i], eps, j+3);
+ infinitesimalVariation(forwardForwardSolution[k], eps, l+3);
+ infinitesimalVariation(forwardBackwardSolution[i], eps, j+3);
+ infinitesimalVariation(forwardBackwardSolution[k], -eps, l+3);
+ infinitesimalVariation(backwardForwardSolution[i], -eps, j+3);
+ infinitesimalVariation(backwardForwardSolution[k], eps, l+3);
+ infinitesimalVariation(backwardBackwardSolution[i],-eps, j+3);
+ infinitesimalVariation(backwardBackwardSolution[k],-eps, l+3);
+
+
+// fdHessian[j][k] = (assembler.computeEnergy(forwardForwardSolution)
+// + assembler.computeEnergy(backwardBackwardSolution)
+// - assembler.computeEnergy(forwardBackwardSolution)
+// - assembler.computeEnergy(backwardForwardSolution)) / (4*eps*eps);
+
+ Dune::FieldVector<double,6> strain;
+ strain = assembler.getStrain(forwardForwardSolution, element, pos);
+ strain += assembler.getStrain(backwardBackwardSolution, element, pos);
+ strain -= assembler.getStrain(forwardBackwardSolution, element, pos);
+ strain -= assembler.getStrain(backwardForwardSolution, element, pos);
+ strain /= 4*eps*eps;
+
+
+ for (int m=0; m<3; m++)
+ rotationDer[m][i][k][j][l] = strain[3+m];
+
+ forwardForwardSolution = x;
+ forwardBackwardSolution = x;
+ backwardForwardSolution = x;
+ backwardBackwardSolution = x;
+
+
+ }
+
+ }
+
+ }
+ }
+
+ }
+
+}
+
+
+template <class GridType>
+void strain2ndOrderFD2(const std::vector<RigidBodyMotion<double,3> >& x,
+ double pos,
+ Dune::FieldVector<double,1> shapeGrad[2],
+ Dune::FieldVector<double,1> shapeFunction[2],
+ Dune::array<Dune::Matrix<Dune::FieldMatrix<double,6,6> >, 3>& translationDer,
+ Dune::array<Dune::Matrix<Dune::FieldMatrix<double,3,3> >, 3>& rotationDer,
+ const RodAssembler<GridType,3>& assembler)
+{
+ assert(x.size()==2);
+ double eps = 1e-3;
+
+ for (int m=0; m<3; m++) {
+
+ translationDer[m].setSize(2,2);
+ translationDer[m] = 0;
+
+ rotationDer[m].setSize(2,2);
+ rotationDer[m] = 0;
+
+ }
+
+ // ///////////////////////////////////////////////////////////
+ // Compute gradient by finite-difference approximation
+ // ///////////////////////////////////////////////////////////
+ std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
+
+ for (int k=0; k<2; k++) {
+
+ for (int l=0; l<3; l++) {
+
+ infinitesimalVariation(forwardSolution[k], eps, l+3);
+ infinitesimalVariation(backwardSolution[k], -eps, l+3);
+
+ Dune::array<Dune::FieldMatrix<double,2,6>, 6> forwardStrainDer;
+ assembler.strainDerivative(forwardSolution, pos, shapeGrad, shapeFunction, forwardStrainDer);
+
+ Dune::array<Dune::FieldMatrix<double,2,6>, 6> backwardStrainDer;
+ assembler.strainDerivative(backwardSolution, pos, shapeGrad, shapeFunction, backwardStrainDer);
+
+ for (int i=0; i<2; i++) {
+ for (int j=0; j<3; j++) {
+ for (int m=0; m<3; m++) {
+ rotationDer[m][i][k][j][l] = (forwardStrainDer[m][i][j]-backwardStrainDer[m][i][j]) / (2*eps);
+ }
+ }
+ }
+
+ forwardSolution = x;
+ backwardSolution = x;
+
+ }
+
+ }
+
+}
+
+
+
+
+
+template <class GridType>
+void expHessianFD()
+{
+ using namespace Dune;
+ double eps = 1e-3;
+
+ // ///////////////////////////////////////////////////////////
+ // Compute gradient by finite-difference approximation
+ // ///////////////////////////////////////////////////////////
+ SkewMatrix<double,3> forward;
+ SkewMatrix<double,3> backward;
+
+ SkewMatrix<double,3> forwardForward;
+ SkewMatrix<double,3> forwardBackward;
+ SkewMatrix<double,3> backwardForward;
+ SkewMatrix<double,3> backwardBackward;
+
+ for (int i=0; i<3; i++) {
+
+ for (int j=0; j<3; j++) {
+
+ Quaternion<double> hessian;
+
+ if (i==j) {
+
+ forward = backward = 0;
+ forward.axial()[i] += eps;
+ backward.axial()[i] -= eps;
+
+ // Second derivative
+ // fdHessian[j][k] = (assembler.computeEnergy(forward)
+ // - 2*assembler.computeEnergy(x)
+ // + assembler.computeEnergy(backward)) / (eps*eps);
+
+ hessian = Rotation<double,3>::exp(forward);
+ hessian += Rotation<double,3>::exp(backward);
+ SkewMatrix<double,3> zero(0);
+ hessian.axpy(-2, Rotation<double,3>::exp(zero));
+ hessian /= eps*eps;
+
+ } else {
+
+ forwardForward = forwardBackward = 0;
+ backwardForward = backwardBackward = 0;
+
+ forwardForward.axial()[i] += eps;
+ forwardForward.axial()[j] += eps;
+ forwardBackward.axial()[i] += eps;
+ forwardBackward.axial()[j] -= eps;
+ backwardForward.axial()[i] -= eps;
+ backwardForward.axial()[j] += eps;
+ backwardBackward.axial()[i] -= eps;
+ backwardBackward.axial()[j] -= eps;
+
+
+ hessian = Rotation<double,3>::exp(forwardForward);
+ hessian += Rotation<double,3>::exp(backwardBackward);
+ hessian -= Rotation<double,3>::exp(forwardBackward);
+ hessian -= Rotation<double,3>::exp(backwardForward);
+ hessian /= 4*eps*eps;
+
+ }
+
+ printf("i: %d, j: %d ", i, j);
+ std::cout << hessian << std::endl;
+
+ }
+
+ }
+}
+
+
+template <class GridType>
+void gradientFDCheck(const std::vector<RigidBodyMotion<double,3> >& x,
+ const Dune::BlockVector<Dune::FieldVector<double,6> >& gradient,
+ const RodAssembler<GridType,3>& assembler)
+{
+#ifndef ABORT_ON_ERROR
+ static int gradientError = 0;
+ double maxError = -1;
+#endif
+ double eps = 1e-6;
+
+ // ///////////////////////////////////////////////////////////
+ // Compute gradient by finite-difference approximation
+ // ///////////////////////////////////////////////////////////
+
+ std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
+
+ for (size_t i=0; i<x.size(); i++) {
+
+ Dune::FieldVector<double,6> fdGradient;
+
+ for (int j=0; j<6; j++) {
+
+ infinitesimalVariation(forwardSolution[i], eps, j);
+ infinitesimalVariation(backwardSolution[i], -eps, j);
+
+ fdGradient[j] = (assembler.computeEnergy(forwardSolution) - assembler.computeEnergy(backwardSolution))
+ / (2*eps);
+
+ forwardSolution[i] = x[i];
+ backwardSolution[i] = x[i];
+ }
+
+ if ( (fdGradient-gradient[i]).two_norm() > 1e-6 ) {
+#ifdef ABORT_ON_ERROR
+ std::cout << "Differing gradients at " << i
+ << "! (" << (fdGradient-gradient[i]).two_norm() / gradient[i].two_norm()
+ << ") Analytical: " << gradient[i] << ", fd: " << fdGradient << std::endl;
+ //std::cout << "Current configuration " << std::endl;
+ for (size_t j=0; j<x.size(); j++)
+ std::cout << x[j] << std::endl;
+ //abort();
+#else
+ gradientError++;
+ maxError = std::max(maxError, (fdGradient-gradient[i]).two_norm());
+#endif
+ }
+
+ }
+
+#ifndef ABORT_ON_ERROR
+ std::cout << gradientError << " errors in the gradient corrected (max: " << maxError << ")!" << std::endl;
+#endif
+
+}
+
+
+template <class GridType>
+void hessianFDCheck(const std::vector<RigidBodyMotion<double,3> >& x,
+ const Dune::BCRSMatrix<Dune::FieldMatrix<double,6,6> >& hessian,
+ const RodAssembler<GridType,3>& assembler)
+{
+#ifndef ABORT_ON_ERROR
+ static int hessianError = 0;
+#endif
+ double eps = 1e-2;
+
+ typedef typename Dune::BCRSMatrix<Dune::FieldMatrix<double,6,6> >::row_type::const_iterator ColumnIterator;
+
+ // ///////////////////////////////////////////////////////////
+ // Compute gradient by finite-difference approximation
+ // ///////////////////////////////////////////////////////////
+ std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
+
+ std::vector<RigidBodyMotion<double,3> > forwardForwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > forwardBackwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardForwardSolution = x;
+ std::vector<RigidBodyMotion<double,3> > backwardBackwardSolution = x;
+
+
+ // ///////////////////////////////////////////////////////////////
+ // Loop over all blocks of the outer matrix
+ // ///////////////////////////////////////////////////////////////
+ for (int i=0; i<hessian.N(); i++) {
+
+ ColumnIterator cIt = hessian[i].begin();
+ ColumnIterator cEndIt = hessian[i].end();
+
+ for (; cIt!=cEndIt; ++cIt) {
+
+ // ////////////////////////////////////////////////////////////////////////////
+ // Compute a finite-difference approximation of this hessian matrix block
+ // ////////////////////////////////////////////////////////////////////////////
+
+ Dune::FieldMatrix<double,6,6> fdHessian;
+
+ for (int j=0; j<6; j++) {
+
+ for (int k=0; k<6; k++) {
+
+ if (i==cIt.index() && j==k) {
+
+ infinitesimalVariation(forwardSolution[i], eps, j);
+ infinitesimalVariation(backwardSolution[i], -eps, j);
+
+ // Second derivative
+ fdHessian[j][k] = (assembler.computeEnergy(forwardSolution)
+ + assembler.computeEnergy(backwardSolution)
+ - 2*assembler.computeEnergy(x)
+ ) / (eps*eps);
+
+ forwardSolution[i] = x[i];
+ backwardSolution[i] = x[i];
+
+ } else {
+
+ infinitesimalVariation(forwardForwardSolution[i], eps, j);
+ infinitesimalVariation(forwardForwardSolution[cIt.index()], eps, k);
+ infinitesimalVariation(forwardBackwardSolution[i], eps, j);
+ infinitesimalVariation(forwardBackwardSolution[cIt.index()], -eps, k);
+ infinitesimalVariation(backwardForwardSolution[i], -eps, j);
+ infinitesimalVariation(backwardForwardSolution[cIt.index()], eps, k);
+ infinitesimalVariation(backwardBackwardSolution[i], -eps, j);
+ infinitesimalVariation(backwardBackwardSolution[cIt.index()],-eps, k);
+
+
+ fdHessian[j][k] = (assembler.computeEnergy(forwardForwardSolution)
+ + assembler.computeEnergy(backwardBackwardSolution)
+ - assembler.computeEnergy(forwardBackwardSolution)
+ - assembler.computeEnergy(backwardForwardSolution)) / (4*eps*eps);
+
+ forwardForwardSolution[i] = x[i];
+ forwardForwardSolution[cIt.index()] = x[cIt.index()];
+ forwardBackwardSolution[i] = x[i];
+ forwardBackwardSolution[cIt.index()] = x[cIt.index()];
+ backwardForwardSolution[i] = x[i];
+ backwardForwardSolution[cIt.index()] = x[cIt.index()];
+ backwardBackwardSolution[i] = x[i];
+ backwardBackwardSolution[cIt.index()] = x[cIt.index()];
+
+ }
+
+ }
+
+ }
+ //exit(0);
+ // /////////////////////////////////////////////////////////////////////////////
+ // Compare analytical and fd Hessians
+ // /////////////////////////////////////////////////////////////////////////////
+
+ Dune::FieldMatrix<double,6,6> diff = fdHessian;
+ diff -= *cIt;
+
+ if ( diff.frobenius_norm() > 1e-5 ) {
+#ifdef ABORT_ON_ERROR
+ std::cout << "Differing hessians at [(" << i << ", "<< cIt.index() << ")]!" << std::endl
+ << "Analytical: " << std::endl << *cIt << std::endl
+ << "fd: " << std::endl << fdHessian << std::endl;
+ abort();
+#else
+ hessianError++;
+#endif
+ }
+
+ }
+
+ }
+
+#ifndef ABORT_ON_ERROR
+ std::cout << hessianError << " errors in the Hessian corrected!" << std::endl;
+#endif
+
+}
int main (int argc, char *argv[]) try
diff --git a/test/fdcheck.hh b/test/fdcheck.hh
deleted file mode 100644
index 49eea2db..00000000
--- a/test/fdcheck.hh
+++ /dev/null
@@ -1,484 +0,0 @@
-#ifndef ASSEMBLER_FINITE_DIFFERENCE_CHECK
-#define ASSEMBLER_FINITE_DIFFERENCE_CHECK
-
-#include <dune/gfe/rigidbodymotion.hh>
-#include <dune/gfe/rodassembler.hh>
-
-#define ABORT_ON_ERROR
-
-void infinitesimalVariation(RigidBodyMotion<double,3>& c, double eps, int i)
-{
- if (i<3)
- c.r[i] += eps;
- else {
- Dune::FieldVector<double,3> axial(0);
- axial[i-3] = eps;
- SkewMatrix<double,3> variation(axial);
- c.q = c.q.mult(Rotation<double,3>::exp(variation));
- }
-}
-
-template <class GridType>
-void strainFD(const std::vector<RigidBodyMotion<double,3> >& x,
- double pos,
- Dune::array<Dune::FieldMatrix<double,2,6>, 6>& fdStrainDerivatives,
- const RodAssembler<GridType,3>& assembler)
-{
- assert(x.size()==2);
- double eps = 1e-8;
-
- typename GridType::template Codim<0>::EntityPointer element = assembler.grid_->template leafbegin<0>();
-
- // ///////////////////////////////////////////////////////////
- // Compute gradient by finite-difference approximation
- // ///////////////////////////////////////////////////////////
- std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
-
- for (size_t i=0; i<x.size(); i++) {
-
- Dune::FieldVector<double,6> fdGradient;
-
- for (int j=0; j<6; j++) {
-
- infinitesimalVariation(forwardSolution[i], eps, j);
- infinitesimalVariation(backwardSolution[i], -eps, j);
-
-// fdGradient[j] = (assembler.computeEnergy(forwardSolution) - assembler.computeEnergy(backwardSolution))
-// / (2*eps);
- Dune::FieldVector<double,6> strain;
- strain = assembler.getStrain(forwardSolution, element, pos);
- strain -= assembler.getStrain(backwardSolution, element, pos);
- strain /= 2*eps;
-
- for (int m=0; m<6; m++)
- fdStrainDerivatives[m][i][j] = strain[m];
-
- forwardSolution[i] = x[i];
- backwardSolution[i] = x[i];
- }
-
- }
-
-}
-
-
-template <class GridType>
-void strain2ndOrderFD(const std::vector<RigidBodyMotion<double,3> >& x,
- double pos,
- Dune::array<Dune::Matrix<Dune::FieldMatrix<double,6,6> >, 3>& translationDer,
- Dune::array<Dune::Matrix<Dune::FieldMatrix<double,3,3> >, 3>& rotationDer,
- const RodAssembler<GridType,3>& assembler)
-{
- assert(x.size()==2);
- double eps = 1e-3;
-
- typename GridType::template Codim<0>::EntityPointer element = assembler.grid_->template leafbegin<0>();
-
- for (int m=0; m<3; m++) {
-
- translationDer[m].setSize(2,2);
- translationDer[m] = 0;
-
- rotationDer[m].setSize(2,2);
- rotationDer[m] = 0;
-
- }
-
- // ///////////////////////////////////////////////////////////
- // Compute gradient by finite-difference approximation
- // ///////////////////////////////////////////////////////////
- std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
-
- std::vector<RigidBodyMotion<double,3> > forwardForwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > forwardBackwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardForwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardBackwardSolution = x;
-
- for (int i=0; i<2; i++) {
-
- for (int j=0; j<3; j++) {
-
- for (int k=0; k<2; k++) {
-
- for (int l=0; l<3; l++) {
-
- if (i==k && j==l) {
-
- infinitesimalVariation(forwardSolution[i], eps, j+3);
- infinitesimalVariation(backwardSolution[i], -eps, j+3);
-
- // Second derivative
-// fdHessian[j][k] = (assembler.computeEnergy(forwardSolution)
-// - 2*assembler.computeEnergy(x)
-// + assembler.computeEnergy(backwardSolution)) / (eps*eps);
-
- Dune::FieldVector<double,6> strain;
- strain = assembler.getStrain(forwardSolution, element, pos);
- strain += assembler.getStrain(backwardSolution, element, pos);
- strain.axpy(-2, assembler.getStrain(x, element, pos));
- strain /= eps*eps;
-
- for (int m=0; m<3; m++)
- rotationDer[m][i][k][j][l] = strain[3+m];
-
- forwardSolution = x;
- backwardSolution = x;
-
- } else {
-
- infinitesimalVariation(forwardForwardSolution[i], eps, j+3);
- infinitesimalVariation(forwardForwardSolution[k], eps, l+3);
- infinitesimalVariation(forwardBackwardSolution[i], eps, j+3);
- infinitesimalVariation(forwardBackwardSolution[k], -eps, l+3);
- infinitesimalVariation(backwardForwardSolution[i], -eps, j+3);
- infinitesimalVariation(backwardForwardSolution[k], eps, l+3);
- infinitesimalVariation(backwardBackwardSolution[i],-eps, j+3);
- infinitesimalVariation(backwardBackwardSolution[k],-eps, l+3);
-
-
-// fdHessian[j][k] = (assembler.computeEnergy(forwardForwardSolution)
-// + assembler.computeEnergy(backwardBackwardSolution)
-// - assembler.computeEnergy(forwardBackwardSolution)
-// - assembler.computeEnergy(backwardForwardSolution)) / (4*eps*eps);
-
- Dune::FieldVector<double,6> strain;
- strain = assembler.getStrain(forwardForwardSolution, element, pos);
- strain += assembler.getStrain(backwardBackwardSolution, element, pos);
- strain -= assembler.getStrain(forwardBackwardSolution, element, pos);
- strain -= assembler.getStrain(backwardForwardSolution, element, pos);
- strain /= 4*eps*eps;
-
-
- for (int m=0; m<3; m++)
- rotationDer[m][i][k][j][l] = strain[3+m];
-
- forwardForwardSolution = x;
- forwardBackwardSolution = x;
- backwardForwardSolution = x;
- backwardBackwardSolution = x;
-
-
- }
-
- }
-
- }
- }
-
- }
-
-}
-
-
-template <class GridType>
-void strain2ndOrderFD2(const std::vector<RigidBodyMotion<double,3> >& x,
- double pos,
- Dune::FieldVector<double,1> shapeGrad[2],
- Dune::FieldVector<double,1> shapeFunction[2],
- Dune::array<Dune::Matrix<Dune::FieldMatrix<double,6,6> >, 3>& translationDer,
- Dune::array<Dune::Matrix<Dune::FieldMatrix<double,3,3> >, 3>& rotationDer,
- const RodAssembler<GridType,3>& assembler)
-{
- assert(x.size()==2);
- double eps = 1e-3;
-
- for (int m=0; m<3; m++) {
-
- translationDer[m].setSize(2,2);
- translationDer[m] = 0;
-
- rotationDer[m].setSize(2,2);
- rotationDer[m] = 0;
-
- }
-
- // ///////////////////////////////////////////////////////////
- // Compute gradient by finite-difference approximation
- // ///////////////////////////////////////////////////////////
- std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
-
- for (int k=0; k<2; k++) {
-
- for (int l=0; l<3; l++) {
-
- infinitesimalVariation(forwardSolution[k], eps, l+3);
- infinitesimalVariation(backwardSolution[k], -eps, l+3);
-
- Dune::array<Dune::FieldMatrix<double,2,6>, 6> forwardStrainDer;
- assembler.strainDerivative(forwardSolution, pos, shapeGrad, shapeFunction, forwardStrainDer);
-
- Dune::array<Dune::FieldMatrix<double,2,6>, 6> backwardStrainDer;
- assembler.strainDerivative(backwardSolution, pos, shapeGrad, shapeFunction, backwardStrainDer);
-
- for (int i=0; i<2; i++) {
- for (int j=0; j<3; j++) {
- for (int m=0; m<3; m++) {
- rotationDer[m][i][k][j][l] = (forwardStrainDer[m][i][j]-backwardStrainDer[m][i][j]) / (2*eps);
- }
- }
- }
-
- forwardSolution = x;
- backwardSolution = x;
-
- }
-
- }
-
-}
-
-
-
-
-
-template <class GridType>
-void expHessianFD()
-{
- using namespace Dune;
- double eps = 1e-3;
-
- // ///////////////////////////////////////////////////////////
- // Compute gradient by finite-difference approximation
- // ///////////////////////////////////////////////////////////
- SkewMatrix<double,3> forward;
- SkewMatrix<double,3> backward;
-
- SkewMatrix<double,3> forwardForward;
- SkewMatrix<double,3> forwardBackward;
- SkewMatrix<double,3> backwardForward;
- SkewMatrix<double,3> backwardBackward;
-
- for (int i=0; i<3; i++) {
-
- for (int j=0; j<3; j++) {
-
- Quaternion<double> hessian;
-
- if (i==j) {
-
- forward = backward = 0;
- forward.axial()[i] += eps;
- backward.axial()[i] -= eps;
-
- // Second derivative
- // fdHessian[j][k] = (assembler.computeEnergy(forward)
- // - 2*assembler.computeEnergy(x)
- // + assembler.computeEnergy(backward)) / (eps*eps);
-
- hessian = Rotation<double,3>::exp(forward);
- hessian += Rotation<double,3>::exp(backward);
- hessian.axpy(-2, Rotation<double,3>::exp(0,0,0));
- hessian /= eps*eps;
-
- } else {
-
- forwardForward = forwardBackward = 0;
- backwardForward = backwardBackward = 0;
-
- forwardForward.axial()[i] += eps;
- forwardForward.axial()[j] += eps;
- forwardBackward.axial()[i] += eps;
- forwardBackward.axial()[j] -= eps;
- backwardForward.axial()[i] -= eps;
- backwardForward.axial()[j] += eps;
- backwardBackward.axial()[i] -= eps;
- backwardBackward.axial()[j] -= eps;
-
-
- hessian = Rotation<double,3>::exp(forwardForward);
- hessian += Rotation<double,3>::exp(backwardBackward);
- hessian -= Rotation<double,3>::exp(forwardBackward);
- hessian -= Rotation<double,3>::exp(backwardForward);
- hessian /= 4*eps*eps;
-
- }
-
- printf("i: %d, j: %d ", i, j);
- std::cout << hessian << std::endl;
-
- }
-
- }
-}
-
-
-template <class GridType>
-void gradientFDCheck(const std::vector<RigidBodyMotion<double,3> >& x,
- const Dune::BlockVector<Dune::FieldVector<double,6> >& gradient,
- const RodAssembler<GridType,3>& assembler)
-{
-#ifndef ABORT_ON_ERROR
- static int gradientError = 0;
- double maxError = -1;
-#endif
- double eps = 1e-6;
-
- // ///////////////////////////////////////////////////////////
- // Compute gradient by finite-difference approximation
- // ///////////////////////////////////////////////////////////
-
- std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
-
- for (size_t i=0; i<x.size(); i++) {
-
- Dune::FieldVector<double,6> fdGradient;
-
- for (int j=0; j<6; j++) {
-
- infinitesimalVariation(forwardSolution[i], eps, j);
- infinitesimalVariation(backwardSolution[i], -eps, j);
-
- fdGradient[j] = (assembler.computeEnergy(forwardSolution) - assembler.computeEnergy(backwardSolution))
- / (2*eps);
-
- forwardSolution[i] = x[i];
- backwardSolution[i] = x[i];
- }
-
- if ( (fdGradient-gradient[i]).two_norm() > 1e-6 ) {
-#ifdef ABORT_ON_ERROR
- std::cout << "Differing gradients at " << i
- << "! (" << (fdGradient-gradient[i]).two_norm() / gradient[i].two_norm()
- << ") Analytical: " << gradient[i] << ", fd: " << fdGradient << std::endl;
- //std::cout << "Current configuration " << std::endl;
- for (size_t j=0; j<x.size(); j++)
- std::cout << x[j] << std::endl;
- //abort();
-#else
- gradientError++;
- maxError = std::max(maxError, (fdGradient-gradient[i]).two_norm());
-#endif
- }
-
- }
-
-#ifndef ABORT_ON_ERROR
- std::cout << gradientError << " errors in the gradient corrected (max: " << maxError << ")!" << std::endl;
-#endif
-
-}
-
-
-template <class GridType>
-void hessianFDCheck(const std::vector<RigidBodyMotion<double,3> >& x,
- const Dune::BCRSMatrix<Dune::FieldMatrix<double,6,6> >& hessian,
- const RodAssembler<GridType,3>& assembler)
-{
-#ifndef ABORT_ON_ERROR
- static int hessianError = 0;
-#endif
- double eps = 1e-2;
-
- typedef typename Dune::BCRSMatrix<Dune::FieldMatrix<double,6,6> >::row_type::const_iterator ColumnIterator;
-
- // ///////////////////////////////////////////////////////////
- // Compute gradient by finite-difference approximation
- // ///////////////////////////////////////////////////////////
- std::vector<RigidBodyMotion<double,3> > forwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardSolution = x;
-
- std::vector<RigidBodyMotion<double,3> > forwardForwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > forwardBackwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardForwardSolution = x;
- std::vector<RigidBodyMotion<double,3> > backwardBackwardSolution = x;
-
-
- // ///////////////////////////////////////////////////////////////
- // Loop over all blocks of the outer matrix
- // ///////////////////////////////////////////////////////////////
- for (int i=0; i<hessian.N(); i++) {
-
- ColumnIterator cIt = hessian[i].begin();
- ColumnIterator cEndIt = hessian[i].end();
-
- for (; cIt!=cEndIt; ++cIt) {
-
- // ////////////////////////////////////////////////////////////////////////////
- // Compute a finite-difference approximation of this hessian matrix block
- // ////////////////////////////////////////////////////////////////////////////
-
- Dune::FieldMatrix<double,6,6> fdHessian;
-
- for (int j=0; j<6; j++) {
-
- for (int k=0; k<6; k++) {
-
- if (i==cIt.index() && j==k) {
-
- infinitesimalVariation(forwardSolution[i], eps, j);
- infinitesimalVariation(backwardSolution[i], -eps, j);
-
- // Second derivative
- fdHessian[j][k] = (assembler.computeEnergy(forwardSolution)
- + assembler.computeEnergy(backwardSolution)
- - 2*assembler.computeEnergy(x)
- ) / (eps*eps);
-
- forwardSolution[i] = x[i];
- backwardSolution[i] = x[i];
-
- } else {
-
- infinitesimalVariation(forwardForwardSolution[i], eps, j);
- infinitesimalVariation(forwardForwardSolution[cIt.index()], eps, k);
- infinitesimalVariation(forwardBackwardSolution[i], eps, j);
- infinitesimalVariation(forwardBackwardSolution[cIt.index()], -eps, k);
- infinitesimalVariation(backwardForwardSolution[i], -eps, j);
- infinitesimalVariation(backwardForwardSolution[cIt.index()], eps, k);
- infinitesimalVariation(backwardBackwardSolution[i], -eps, j);
- infinitesimalVariation(backwardBackwardSolution[cIt.index()],-eps, k);
-
-
- fdHessian[j][k] = (assembler.computeEnergy(forwardForwardSolution)
- + assembler.computeEnergy(backwardBackwardSolution)
- - assembler.computeEnergy(forwardBackwardSolution)
- - assembler.computeEnergy(backwardForwardSolution)) / (4*eps*eps);
-
- forwardForwardSolution[i] = x[i];
- forwardForwardSolution[cIt.index()] = x[cIt.index()];
- forwardBackwardSolution[i] = x[i];
- forwardBackwardSolution[cIt.index()] = x[cIt.index()];
- backwardForwardSolution[i] = x[i];
- backwardForwardSolution[cIt.index()] = x[cIt.index()];
- backwardBackwardSolution[i] = x[i];
- backwardBackwardSolution[cIt.index()] = x[cIt.index()];
-
- }
-
- }
-
- }
- //exit(0);
- // /////////////////////////////////////////////////////////////////////////////
- // Compare analytical and fd Hessians
- // /////////////////////////////////////////////////////////////////////////////
-
- Dune::FieldMatrix<double,6,6> diff = fdHessian;
- diff -= *cIt;
-
- if ( diff.frobenius_norm() > 1e-5 ) {
-#ifdef ABORT_ON_ERROR
- std::cout << "Differing hessians at [(" << i << ", "<< cIt.index() << ")]!" << std::endl
- << "Analytical: " << std::endl << *cIt << std::endl
- << "fd: " << std::endl << fdHessian << std::endl;
- abort();
-#else
- hessianError++;
-#endif
- }
-
- }
-
- }
-
-#ifndef ABORT_ON_ERROR
- std::cout << hessianError << " errors in the Hessian corrected!" << std::endl;
-#endif
-
-}
-
-#endif
--
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