shamrock.external.coala.utils_polynomials.dphik

shamrock.external.coala.utils_polynomials.dphik(ak, hj, xij)

Derivative of P_k(xij) with respect to x, where xij = 2/hj*(x-xj)

Parameters

ak1D array (dim = k+1), type -> float

coefficients of polynomial of order k, sorted from low to high order

hjscalar, type -> float

width of the bin

xijscalar, type -> float

variable mapping the mass bin j in [-1,1], needed for Legendre polynomials

Returns

Evaluation at xij of the derivative of P_k(xij) with respect to x