selectCore {goCluster} | R Documentation

## A menu function

### Description

The function generates a generic textual menu that will return the choice of the user.

### Usage

    selectCore(message,
    convert = function(X) X,
    check = function(X) TRUE,
    options = NULL,
    error = function(X) return("Invalid choice!"),
    ...
    )

### Arguments

`message` | The informational message that will be shown together with the menu.
`convert` | A function that converts the user input to a desired format or class type.
`check` | A function that checks the user input for validity.
`options` | The available options as character vector, if any.
`error` | The function that should be executed in case of an error. This should deliver a message that is useful to the user.
`...` | Additional arguments for the convert, check and error functions.

### Details

selectCore is a function that provides a generic menu. Currently this is a simple textual menu but it could be extended to a graphical version. The function needs a message that should be displayed to the user, a function to convert the user input to a desired format and another function to check the validity of the user input. Finally a set of options that should be displayed to the user as a numbered list can be specified as a character vector. If `convert` is not specified, the user input will be used as given (string format) and if `check` is left unspecified, the check will always return TRUE.

### Value

The choice of the user in the format returned by the convert function.

### Author(s)

Gunnar Wrobel, http://www.gunnarwrobel.de.

### See Also

`selectOption`, `selectDouble`, `selectNumber`.

### Examples

    ## This example needs to be commented since it needs user input
    ## and would prevent R CMD check from running. Please remove the comment
    ## in the following line to run the example.

    ## selectCore("Please choose a number between 0 and 10",convert=function(X) as.integer(X), check=function(X) (X > 0 & X < 10))

[Package goCluster version 1.0.0 Index]