The method filter launches libbi to filter state trajectories.
See the options to run.libbi for how to specify the various
components of sampling with LibBi, and the LibBi manual for all options
that can be passed when the client is filter.
If x is given as a 'bi_model', a libbi object will be
created from the model For the help page of the base R filter
function, see filter.
Value
an updated libbi object