Determine if the first element of a parse tree is identical to the c function.
This provides a quick way to evaluate whether the
vectors have a
c() wrapping. This is important for subsequent
subsetting of the respective vectors. Those vectors without a
wrapping will be wrapped by
list(). Symbols are not passed to
is.c() due to the subsetting of the first element of the parse-tree.
A parse tree generated by
Want to suggest features or report bugs for rdrr.io? Use the GitHub issue tracker.