mirror of
https://github.com/cosmo-sims/monofonIC.git
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68 lines
No EOL
1.6 KiB
C++
68 lines
No EOL
1.6 KiB
C++
#pragma once
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#include <vector>
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#include <cassert>
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#include <gsl/gsl_spline.h>
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#include <gsl/gsl_errno.h>
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template <bool logx, bool logy, bool periodic>
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class interpolated_function_1d
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{
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private:
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bool isinit_;
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std::vector<double> data_x_, data_y_;
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gsl_interp_accel *gsl_ia_;
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gsl_spline *gsl_sp_;
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void deallocate()
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{
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gsl_spline_free(gsl_sp_);
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gsl_interp_accel_free(gsl_ia_);
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}
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public:
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interpolated_function_1d(const interpolated_function_1d &) = delete;
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interpolated_function_1d() : isinit_(false){}
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interpolated_function_1d(const std::vector<double> &data_x, const std::vector<double> &data_y)
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: isinit_(false)
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{
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this->set_data( data_x, data_y );
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}
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~interpolated_function_1d()
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{
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if (isinit_) this->deallocate();
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}
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void set_data(const std::vector<double> &data_x, const std::vector<double> &data_y)
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{
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data_x_ = data_x;
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data_y_ = data_y;
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assert(data_x_.size() == data_y_.size());
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assert(data_x_.size() > 5);
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assert(!(logx & periodic));
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if (logx) for (auto &d : data_x_) d = std::log(d);
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if (logy) for (auto &d : data_y_) d = std::log(d);
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if (isinit_) this->deallocate();
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gsl_ia_ = gsl_interp_accel_alloc();
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gsl_sp_ = gsl_spline_alloc(periodic ? gsl_interp_cspline_periodic : gsl_interp_cspline, data_x_.size());
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gsl_spline_init(gsl_sp_, &data_x_[0], &data_y_[0], data_x_.size());
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isinit_ = true;
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}
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double operator()(double x) const noexcept
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{
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assert( isinit_ && !(logx&&x<=0.0) );
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double xa = logx ? std::log(x) : x;
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double y(gsl_spline_eval(gsl_sp_, xa, gsl_ia_));
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return logy ? std::exp(y) : y;
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}
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}; |