Update the parameters based on Newton-Raphson step.
McCullagh_update_parameters(update, step, psi, delta, alpha, c = 1)list containing new parameters psi: matrix of symmetry parameters delta; scalar or vector of asymmetry parameters alpha: vector of asymmetry parameters c: scaling coefficient to ensure pi sums to 1.0
vector of update values
size of candidate step along direction of update
vector of symmetry parameters
scalar or vector of asymmetry parameters
vector of asymmetry parameters
normalization factor to make sum pf pi = 1.0. Default value is 1.0.