Constructor for projections objects

This function builds a valid projections object from some input simulations and dates.

Usage

build_projections(x, dates = NULL, cumulative = FALSE, order_dates = TRUE)

x: A matrix of simulated incidence stored as integers, where rows correspond to dates and columns to simulations.
dates: A vector of dates containing one value per row in x; acceptable formats are: integer, Date, and POSIXct; if NULL, the time steps will be counted, with the first dates corresponding to 0.
cumulative: A logical indicating if data represent cumulative incidence; defaults to FALSE.
order_dates: A logical indicating whether the dates should be ordered, from the oldest to the most recent one; `TRUE` by default.