select.list(choices, preselect = NULL, multiple = FALSE,
title = NULL, graphics = getOption("menu.graphics"))NULL. If non-null and
if the string(s) appear in the list, the item(s) are selected
initially.NULL for no title.multiple is false and
no item was selected (or Cancel was used), "" is
returned. If multiple is true and no item was selected (or
Cancel was used) then a character vector of length 0 is returned.graphics = TRUE.
This brings up a modal dialog box with a (scrollable) list
of items, which can be selected by the mouse. If multiple is
true, further items can be selected or deselected by holding the
control key down whilst selecting, and shift-clicking can be used to
select ranges. Normal termination is via the ‘OK’ button or by hitting Enter or
double-clicking an item. Selection can be aborted via the
‘Cancel’ button or pressing Escape.
Under the macOS GUI this brings up a modal dialog box
with a (scrollable) list of items, which can be selected by the mouse.
On other Unix-like platforms it will use a
Tcl/Tk listbox widget if possible. If graphics is FALSE or no graphical widget is available it
displays a text list from which the user can choose by number(s). The
multiple = FALSE case uses menu. Preselection is
only supported for multiple = TRUE, where it is indicated by a
"+" preceding the item. It is an error to use select.list in a non-interactive session.menu, tk_select.list for a graphical
version using Tcl/Tk.