Evaluate a Chebyshev series on a ciphertext

Uses OpenFHE's default algorithm selector, which routes to eval_chebyshev_linear() for degree < 5 and eval_chebyshev_ps() (Paterson-Stockmeyer) for higher degrees. Call the variants directly to force one algorithm or the other.

Usage

eval_chebyshev(ct, coefficients, a, b)

Arguments

ct

A Ciphertext

coefficients

Numeric vector of Chebyshev coefficients

a

Lower bound of the approximation interval

b

Upper bound of the approximation interval

Value

A Ciphertext

See also

eval_chebyshev_coefficients() and eval_chebyshev_function() for constructing the coefficient vector from a user-supplied function; eval_chebyshev_linear() / eval_chebyshev_ps() for forcing the algorithm.