This function implements the Exponential map to calculate \(\hat{F}_t(u)\) for all \(u\) in the cdf/pdf support
Exp_Map_Barycenter_Method(density.grid, forecast, cdf)A numeric vector that contains \(\hat{F}_t(u)\) evaluated over density.grid
The values where the cdf \(\hat{F}\) is evaluated
A vector that contains the WAR(p) model forecast result
The quantile grid used in forecasting
Wasserstein Autoregressive Models for Density Time Series, Chao Zhang, Piotr Kokoszka, Alexander Petersen, 2022