R: Identify points in plot.

identify3d {rgl} | R Documentation

## Identify points in plot.

### Description

Identify points in a plot, similarly to the `identify` function in base graphics.

### Usage

    identify3d(x, y = NULL, z = NULL, labels = seq_along(x), n = length(x),
    	plot = TRUE, adj = c(-0.1, 0.5), tolerance = 20,
    	buttons = c("right", "middle"))

### Arguments

`x, y, z` | coordinates of points in a scatter plot. Alternatively, any object which defines coordinates (see `xyz.coords`) can be given as `x`, and `y` and `z` left missing.
`labels` | an optional character vector giving labels for the points. Will be coerced using `as.character`, and recycled if necessary to the length of `x`.
`n` | the maximum number of points to be identified.
`plot` | logical: if `plot` is `TRUE`, the labels are printed near the points and if `FALSE` they are omitted.
`adj` | numeric vector to use as `adj` parameter to `text3d` when plotting the labels.
`tolerance` | the maximal distance (in pixels) for the pointer to be ‘close enough’ to a point.
`buttons` | a length 1 or 2 character vector giving the buttons to use for selection and quitting.

### Details

If `buttons` is length 1, the user can quit by reaching `n` selections, or by hitting the escape key, but the result will be lost if escape is used.

### Value

A vector of selected indices.

### Author(s)

Duncan Murdoch

### See Also

`identify` for base graphics, `select3d` for selecting regions.

[Package rgl version 0.99.9 Index]