mirror of
https://github.com/cosmo-sims/monofonIC.git
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85 lines
No EOL
2.5 KiB
C++
85 lines
No EOL
2.5 KiB
C++
// This file is part of monofonIC (MUSIC2)
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// A software package to generate ICs for cosmological simulations
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// Copyright (C) 2020 by Oliver Hahn
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//
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// monofonIC is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// monofonIC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#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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static_assert(!(logx & periodic),"Class \'interpolated_function_1d\' cannot both be periodic and logarithmic in x!");
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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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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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const double xa = logx ? std::log(x) : x;
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const 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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}; |