Chebyshev1Basis1d.h

Go to the documentation of this file.

// -*- LSST-C++ -*-
/*
 * Developed for the LSST Data Management System.
 * This product includes software developed by the LSST Project
 * (https://www.lsst.org).
 * See the COPYRIGHT file at the top-level directory of this distribution
 * for details of code ownership.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#ifndef LSST_AFW_MATH_POLYNOMIALS_Chebyshev1Basis1d_h_INCLUDED
#define LSST_AFW_MATH_POLYNOMIALS_Chebyshev1Basis1d_h_INCLUDED
 
#include "lsst/geom/polynomials/RecurrenceBasis1d.h"
#include "lsst/geom/polynomials/ScaledBasis1d.h"
#include "lsst/geom/polynomials/Scaling1d.h"
 
namespace lsst { namespace geom { namespace polynomials {

class Chebyshev1Recurrence {
public:
 
    static double getB0(double x) { return 1; }
 
    static double getB1(double x) { return x; }
 
    static double next(double x, std::size_t n, double current, double previous) { return 2*x*current - previous; }
 
};

using Chebyshev1Basis1d = RecurrenceBasis1d<Chebyshev1Recurrence>;

using ScaledChebyshev1Basis1d = ScaledBasis1d<Chebyshev1Basis1d>;
 
}}} // namespace lsst::geom::polynomials
 
#endif // !LSST_AFW_MATH_POLYNOMIALS_Chebyshev1Basis1d_h_INCLUDED