R: Select Items from a List

select.list {utils}

R Documentation

Select Items from a List

Description

Select item(s) from a character vector.

Usage

select.list(choices, preselect = NULL, multiple = FALSE, title = NULL,
             graphics = getOption("menu.graphics"))

Arguments

choices

a character vector of items.

preselect

a character vector, or NULL. If non-null and if the string(s) appear in the list, the item(s) are selected initially.

multiple

logical: can more than one item be selected?

title

optional character string for window title, or NULL for no title.

graphics

logical: should a graphical widget be used?

Details

The normal default is graphics = TRUE.

Under the Mac OS X 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.

Value

A character vector of selected items. If 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.

Examples

## Not run: 
select.list(sort(.packages(all.available = TRUE)))

## End(Not run)

[Package utils version 2.14.1 ]