sub-.keepattr.RdThis is a special version for objects (in particular data frames or matrices) with the 'keepattr' class,
that will keep attributes on extraction.
If the object x is a variational matrix or FIM, they will be kept only if the result is still a valid
variational matrix or FIM, respectively.
# S3 method for keepattr
[(x, ...)object from which to extract element(s) or in which to replace element(s).
other arguments passed to a parent generic. Typically used to specify a subset.
The specified subset of x. If x is a variational matrix or FIM, and the result
of subsetting is not a valid variational matrix or FIM, then the attributes will be lost.
This can happen for example when the FIM is no longer a square matrix.
They will also be lost if the class changes.
This can happen for example when a single element is extracted.
Other retrieval functions:
getAllParsFim(),
getAllParsVariations(),
getParVecFim(),
getParVecVariations(),
getParsFim(),
getParsVariations(),
subFim()