void mean_quartic_displacement<dimension, float_type>::operator() (
sample_type const& first
, sample_type const& second
, accumulator<result_type>& result
)
{
accumulator<result_type> acc;
typename sample_type::array_type::const_iterator r1, r2, end = first.data().end();
for (r1 = first.data().begin(), r2 = second.data().begin(); r1 != end; ++r1, ++r2) {
// accumulate quartic displacement
acc(correlate_function_type()(*r1, *r2));
}
result(acc);
}
sample_type projection_point(sample_type &u,sample_type &v, sample_type &p)
{
// the length of the segment
trajcomp::default_element_distance_squared<sample_type> d2;
double l = d2(u,v);
if (fabs(l) < 1E-12)
return u;
double t = 0;
for (size_t i=0; i < u.size(); i++)
t += ((v[i]-u[i])*(p[i]-u[i]));
t/=l;
sample_type proj;
for (size_t i=0; i < u.size(); i++)
//proj.push_back(v[i]+t*(u[i]-v[i]));
proj.push_back(u[i]+t*(v[i]-u[i]));
return proj;
}
static std::size_t wrap_nparticle(sample_type const& self)
{
return self.data().size();
}