powered by
Does every level of f1 occur in conjunction with exactly one level of f2? The function is based on converting a triplet sparse matrix to a compressed column-oriented form in which the nesting can be quickly evaluated.
isNested(f1, f2)
factor 1
factor 2
TRUE if factor 1 is nested within factor 2
# NOT RUN { with(Pastes, isNested(cask, batch)) ## => FALSE with(Pastes, isNested(sample, batch)) ## => TRUE # }
Run the code above in your browser using DataLab