Chebyshev1Basis1d.h

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// -*- LSST-C++ -*-
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#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