Print the only the head of an R object
head_print(x, max_lines = 20, header = "", footer = "",
  omitted_footer = "", ...)The object to print, or a callback function. See
printer_callback for details.
Maximum number of lines to print, not including the header and the footer.
The header, if a function, then it will be called,
otherwise printed using cat.
The footer, if a function, then it will be called,
otherwise printed using cat.
Footer that is only printed if anything
is omitted from the printout. If a function, then it will be called,
otherwise printed using cat.
Extra arguments to pass to print().
x, invisibly.