examples/multiprecision.cpp

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#include "pinocchio/math/multiprecision.hpp"
 
#include "pinocchio/parsers/urdf.hpp"
 
#include "pinocchio/algorithm/joint-configuration.hpp"
#include "pinocchio/algorithm/rnea.hpp"
 
#include <boost/multiprecision/cpp_dec_float.hpp>
 
#include <iostream>
 
// PINOCCHIO_MODEL_DIR is defined by the CMake but you can define your own directory here.
#ifndef PINOCCHIO_MODEL_DIR
  #define PINOCCHIO_MODEL_DIR "path_to_the_model_dir"
#endif
 
int main(int argc, char ** argv)
{
  using namespace pinocchio;
 
  // You should change here to set up your own URDF file or just pass it as an argument of this
  // example.
  const std::string urdf_filename =
    (argc <= 1) ? PINOCCHIO_MODEL_DIR
                    + std::string("/example-robot-data/robots/ur_description/urdf/ur5_robot.urdf")
                : argv[1];
 
  // Load the URDF model
  Model model;
  pinocchio::urdf::buildModel(urdf_filename, model);
 
  // Build a data related to model
  Data data(model);
 
  // Define Model and Data for multiprecision types
  typedef ::boost::multiprecision::number<
    ::boost::multiprecision::cpp_dec_float<100>, ::boost::multiprecision::et_off>
    float_100;
  typedef ModelTpl<float_100> ModelMulti;
  typedef DataTpl<float_100> DataMulti;
 
  ModelMulti model_multi = model.cast<float_100>();
  DataMulti data_multi(model_multi);
 
  // Sample a random joint configuration as well as random joint velocity and acceleration
  ModelMulti::ConfigVectorType q_multi = randomConfiguration(model_multi);
  ModelMulti::TangentVectorType v_multi = ModelMulti::TangentVectorType::Random(model.nv);
  ModelMulti::TangentVectorType a_multi = ModelMulti::TangentVectorType::Random(model.nv);
 
  Model::ConfigVectorType q = q_multi.cast<double>();
  Model::TangentVectorType v = v_multi.cast<double>();
  Model::TangentVectorType a = a_multi.cast<double>();
 
  // Computes the inverse dynamics (aka RNEA)
  rnea(model, data, q, v, a);
  rnea(model_multi, data_multi, q_multi, v_multi, a_multi);
 
  // Get access to the joint torque with standard or multiprecision arithmetic and print sufficient
  // decimals for both precisions
  std::cout << "Joint torque standard arithmetic:\n"
            << std::setprecision(std::numeric_limits<float_100>::max_digits10) << data.tau
            << std::endl;
  std::cout << "Joint torque multiprecision arithmetic:\n"
            << std::setprecision(std::numeric_limits<float_100>::max_digits10) << data_multi.tau
            << std::endl;
}