bool Solver_LP_abstract::readLpFromFile(const std::string& filename,
VectorX &c, VectorX &lb, VectorX &ub,
MatrixXX &A, VectorX &Alb, VectorX &Aub)
{
std::ifstream in(filename.c_str(), std::ios::in | std::ios::binary);
typename MatrixXX::Index n=0, m=0;
in.read((char*) (&n),sizeof(typename MatrixXX::Index));
in.read((char*) (&m),sizeof(typename MatrixXX::Index));
c.resize(n);
lb.resize(n);
ub.resize(n);
A.resize(m,n);
Alb.resize(m);
Aub.resize(m);
in.read( (char *) c.data() , n*sizeof(typename MatrixXX::Scalar) );
in.read( (char *) lb.data() , n*sizeof(typename MatrixXX::Scalar) );
in.read( (char *) ub.data() , n*sizeof(typename MatrixXX::Scalar) );
in.read( (char *) A.data() , m*n*sizeof(typename MatrixXX::Scalar) );
in.read( (char *) Alb.data() , m*sizeof(typename MatrixXX::Scalar) );
in.read( (char *) Aub.data() , m*sizeof(typename MatrixXX::Scalar) );
in.close();
return true;
}
void Simulation::computeForces(const VectorX& x, VectorX& force)
{
VectorX gradient;
gradient.resize(m_mesh->m_system_dimension);
gradient.setZero();
// springs
for (std::vector<Constraint*>::iterator it = m_constraints.begin(); it != m_constraints.end(); ++it)
{
(*it)->EvaluateGradient(x, gradient);
}
// external forces
gradient -= m_external_force;
force = -gradient;
}