scipy.special.eval_chebyu#
- scipy.special.eval_chebyu(n, x, out=None) = <ufunc 'eval_chebyu'>#
Evaluate Chebyshev polynomial of the second kind at a point.
The Chebyshev polynomials of the second kind can be defined via the Gauss hypergeometric function \({}_2F_1\) as
\[U_n(x) = (n + 1) {}_2F_1(-n, n + 2; 3/2; (1 - x)/2).\]When \(n\) is an integer the result is a polynomial of degree \(n\). See 22.5.48 in [AS] for details.
- Parameters
- narray_like
Degree of the polynomial. If not an integer, the result is determined via the relation to the Gauss hypergeometric function.
- xarray_like
Points at which to evaluate the Chebyshev polynomial
- outndarray, optional
Optional output array for the function values
- Returns
- Uscalar or ndarray
Values of the Chebyshev polynomial
See also
roots_chebyu
roots and quadrature weights of Chebyshev polynomials of the second kind
chebyu
Chebyshev polynomial object
eval_chebyt
evaluate Chebyshev polynomials of the first kind
hyp2f1
Gauss hypergeometric function
References
- AS
Milton Abramowitz and Irene A. Stegun, eds. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. New York: Dover, 1972.