smash::InterpolateDataLinear< T > Class Template Reference

#include <interpolation.h>

template<typename T>
class smash::InterpolateDataLinear< T >

Represent a piecewise linear interpolation.

Parameters

T	Type of interpolated values.

Definition at line 62 of file interpolation.h.

Collaboration diagram for smash::InterpolateDataLinear< T >:

Public Member Functions
	InterpolateDataLinear (const std::vector< T > &x, const std::vector< T > &y)
	Interpolate function f given discrete samples f(x_i) = y_i. More...
T	operator() (T x) const
	Calculate spline interpolation at x. More...

Private Attributes
std::vector< T >	x_
	x_i More...
std::vector< InterpolateLinear< T > >	f_
	Piecewise linear interpolation using f(x_i) More...

Constructor & Destructor Documentation

InterpolateDataLinear()

template<typename T >

smash::InterpolateDataLinear< T >::InterpolateDataLinear	(	const std::vector< T > &	x,
		const std::vector< T > &	y
	)

Interpolate function f given discrete samples f(x_i) = y_i.

Parameters

x	x-values.
y	y-values.

Returns

The interpolation function.

Piecewise linear interpolation is used. Values outside the given samples will use the outmost linear interpolation.

Definition at line 195 of file interpolation.h.

                                                                       {
  assert(x.size() == y.size());
  const size_t n = x.size();
  const auto p = generate_sort_permutation(
      x, [&](T const& a, T const& b) { return a < b; });
  x_ = apply_permutation(x, p);
  check_duplicates(x_, "InterpolateDataLinear");
  std::vector<T> y_sorted = std::move(apply_permutation(y, p));
  f_.reserve(n - 1);
  for (size_t i = 0; i < n - 1; i++) {
    f_.emplace_back(
        InterpolateLinear<T>(x_[i], y_sorted[i], x_[i + 1], y_sorted[i + 1]));
  }
}

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Member Function Documentation

operator()()

template<typename T >

T smash::InterpolateDataLinear< T >::operator()

(

T

x

)

const

Calculate spline interpolation at x.

Parameters

x	Interpolation argument.

Returns

Interpolated value.

Definition at line 240 of file interpolation.h.

                                                 {
  // Find the piecewise linear interpolation corresponding to x0.
  size_t i = find_index(x_, x0);
  if (i >= f_.size()) {
    // We don't have a linear interpolation beyond the last point in x_.
    // Use the last linear interpolation instead.
    i = f_.size() - 1;
  }
  return f_[i](x0);
}

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Member Data Documentation

x_

template<typename T >

std::vector<T> smash::InterpolateDataLinear< T >::x_

private

x_i

Definition at line 86 of file interpolation.h.

f_

template<typename T >

std::vector<InterpolateLinear<T> > smash::InterpolateDataLinear< T >::f_

private

Piecewise linear interpolation using f(x_i)

Definition at line 88 of file interpolation.h.

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The documentation for this class was generated from the following file:

• src/include/smash/interpolation.h