Class lsst::afw::math::Chebyshev1Function1

template<typename ReturnT>
class Chebyshev1Function1 : public lsst::afw::math::Function1<ReturnT>

1-dimensional weighted sum of Chebyshev polynomials of the first kind.

f(x) = c0 T0(x’) + c1 T1(x’) + c2 T2(x’) + … = c0 + c1 T1(x’) + c2 T2(x’) + … where:

• Tn(x) is the nth Chebyshev function of the first kind: T0(x) = 1 T1(x) = 2 Tn+1(x) = 2xTn(x) + Tn-1(x)

• x’ is x offset and scaled to range [-1, 1] as x ranges over [minX, maxX]

The function argument must be in the range [minX, maxX].