Update simulated paths with new observations (FOXY algorithm)
# S3 method for WarpKriging
update_simulate(object, y_u, X_u, noise_u = NULL, ...)matrix (m x nsim) of updated simulated paths
WarpKriging object (must have called simulate with will_update=TRUE)
new observations
new input matrix
optional numeric vector of per-observation noise variances
for the update points (length nrow(X_u)); required when the model was
fitted with noise.
ignored