Select item(s) from a list.

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Description

Provides the same functionality as select.list from the utils package, but is intended to broaden the range of systems where selection can be made through the graphical dialog provided Java 1.5 or higher is installed. 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. If 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 rselect.list in a non-interactive session.

Usage

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  rselect.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 indicating if a graphical widget should be used. return 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.

Author(s)

Alex Lisovich, Roger Day

See Also

jselect.list, select.list

Examples

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## Not run: 
rselect.list(c("Peter", "Alex", "Roger", "Leah"),title="Select", multiple=TRUE);

## End(Not run)