Given a list 'x' of R objects from the same class and same format, 'unlist' simplifies it to produce a new R object which contains all the initial components which in 'x' object.
unlist(x, recursive = TRUE, use.names = TRUE)Any list of R objects.
This function try to completely flattening a list. If it fail, then
the result for unlist function (recursive = TRUE and
use.names = TRUE) is returned