| menu {utils} | R Documentation |
Menu Interaction Function
Description
menu presents the user with a menu of choices labelled from 1
to the number of choices. To exit without choosing an item one can
select ‘0’.
Usage
menu(choices, graphics = FALSE, title = NULL)
Arguments
choices |
a character vector of choices |
graphics |
a logical indicating whether a graphics menu should be used if available. |
title |
a character string to be used as the title of the menu.
|
Details
If graphics = TRUE and a windowing system is available
(Windows, macOS or X11 via Tcl/Tk) a listbox widget is
used, otherwise a text menu. It is an error to use menu in a
non-interactive session.
Ten or fewer items will be displayed in a single column, more in multiple columns if possible within the current display width.
No title is displayed if title is NULL or "".
Value
The number corresponding to the selected item, or 0 if no choice was made.
References
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
See Also
select.list, which is used to implement the graphical
menu, and allows multiple selections.
Examples
## Not run:
switch(menu(c("List letters", "List LETTERS")) + 1,
cat("Nothing done\n"), letters, LETTERS)
## End(Not run)