Hi all, Would you generally consider NULL to be a vector? Base R functions are a little inconsistent:
## In favour ``` r identical(as.vector(NULL), NULL) #> [1] TRUE identical(as(NULL, "vector"), NULL) #> [1] TRUE # supports key vector vector generics length(NULL) #> [1] 0 NULL[c(3, 4, 5)] #> NULL NULL[[1]] #> NULL ``` ## Against ``` r is.vector(NULL) #> [1] FALSE is(NULL, "vector") #> [1] FALSE ``` ## Abstentions ``` r is.atomic(NULL) #> [1] TRUE # documentation states "returns NULL if x is of an atomic type (or NULL)" # is "or" exclusive or inclusive? ``` Hadley -- http://hadley.nz ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
