63 lines
2.6 KiB
C++
63 lines
2.6 KiB
C++
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// Copyright Nick Thompson, 2019
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_INTERPOLATORS_CARDINAL_QUINTIC_B_SPLINE_HPP
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#define BOOST_MATH_INTERPOLATORS_CARDINAL_QUINTIC_B_SPLINE_HPP
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#include <memory>
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#include <limits>
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#include <boost/math/interpolators/detail/cardinal_quintic_b_spline_detail.hpp>
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namespace boost{ namespace math{ namespace interpolators {
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template <class Real>
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class cardinal_quintic_b_spline
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{
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public:
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// If you don't know the value of the derivative at the endpoints, leave them as nans and the routine will estimate them.
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// y[0] = y(a), y[n - 1] = y(b), step_size = (b - a)/(n -1).
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cardinal_quintic_b_spline(const Real* const y,
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size_t n,
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Real t0 /* initial time, left endpoint */,
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Real h /*spacing, stepsize*/,
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std::pair<Real, Real> left_endpoint_derivatives = {std::numeric_limits<Real>::quiet_NaN(), std::numeric_limits<Real>::quiet_NaN()},
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std::pair<Real, Real> right_endpoint_derivatives = {std::numeric_limits<Real>::quiet_NaN(), std::numeric_limits<Real>::quiet_NaN()})
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: impl_(std::make_shared<detail::cardinal_quintic_b_spline_detail<Real>>(y, n, t0, h, left_endpoint_derivatives, right_endpoint_derivatives))
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{}
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// Oh the bizarre error messages if we template this on a RandomAccessContainer:
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cardinal_quintic_b_spline(std::vector<Real> const & y,
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Real t0 /* initial time, left endpoint */,
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Real h /*spacing, stepsize*/,
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std::pair<Real, Real> left_endpoint_derivatives = {std::numeric_limits<Real>::quiet_NaN(), std::numeric_limits<Real>::quiet_NaN()},
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std::pair<Real, Real> right_endpoint_derivatives = {std::numeric_limits<Real>::quiet_NaN(), std::numeric_limits<Real>::quiet_NaN()})
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: impl_(std::make_shared<detail::cardinal_quintic_b_spline_detail<Real>>(y.data(), y.size(), t0, h, left_endpoint_derivatives, right_endpoint_derivatives))
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{}
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Real operator()(Real t) const {
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return impl_->operator()(t);
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}
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Real prime(Real t) const {
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return impl_->prime(t);
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}
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Real double_prime(Real t) const {
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return impl_->double_prime(t);
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}
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Real t_max() const {
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return impl_->t_max();
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}
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private:
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std::shared_ptr<detail::cardinal_quintic_b_spline_detail<Real>> impl_;
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};
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}}}
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#endif
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