An indexing method for functional time series (funts) objects.
# S3 method for funts
[(obj, i = NULL, j = NULL)an `funts` object containing the specified subsets
an object of class funts.
an index or indices specifying the subsets of times to extract.
an index or indices specifying the subsets of variables to extract.
This function allows you to extract specific subsets of a functional time series based on the provided indices. You can specify which subsets you want to extract from the functional time series.
funts