R: Determine the number of levels in an object.

depth {grid} | R Documentation

## Determine the number of levels in an object.

### Description

Determine the number of levels in a viewport stack or tree, in a viewport path, or in a grob path.

### Usage

    depth(x, ...)
    ## S3 method for class 'viewport'
    depth(x, ...)
    ## S3 method for class 'path'
    depth(x, ...)

### Arguments

`x` | Typically a viewport or viewport stack or viewport tree or viewport list, or a viewport path, or a grob path.
`...` | Arguments used by other methods.

### Details

Depths of paths are pretty straightforward because they contain no branchings. The depth of a viewport stack is the sum of the depths of the components of the stack. The depth of a viewport tree is the depth of the parent plus the depth of the children. The depth of a viewport list is the depth of the last component of the list.

### Value

An integer value.

### See Also

`viewport`, `vpPath`, `gPath`.

### Examples

    vp <- viewport()
    depth(vp)
    depth(vpStack(vp, vp))
    depth(vpList(vpStack(vp, vp), vp))
    depth(vpPath("vp"))
    depth(vpPath("vp1", "vp2"))

[Package grid version 3.1.2 Index]