headtail {spatstat.geom}

First or Last Part of a Spatial Pattern

Description

Returns the first few elements (head) or the last few elements (tail) of a spatial pattern.

Usage

  ## S3 method for class 'ppp'
head(x, n = 6L, ...)

  ## S3 method for class 'ppx'
head(x, n = 6L, ...)

  ## S3 method for class 'psp'
head(x, n = 6L, ...)

  ## S3 method for class 'tess'
head(x, n = 6L, ...)

  ## S3 method for class 'ppp'
tail(x, n = 6L, ...)

  ## S3 method for class 'ppx'
tail(x, n = 6L, ...)

  ## S3 method for class 'psp'
tail(x, n = 6L, ...)

  ## S3 method for class 'tess'
tail(x, n = 6L, ...)

Arguments

x

A spatial pattern of geometrical figures, such as a spatial pattern of points (an object of class "ppp", "pp3", "ppx" or "lpp") or a spatial pattern of line segments (an object of class "psp") or a tessellation (object of class "tess").

n

Integer. The number of elements of the pattern that should be extracted.

...

Ignored.

Details

These are methods for the generic functions head and tail. They extract the first or last n elements from x and return them as an object of the same kind as x.

To inspect the spatial coordinates themselves, use View(x) or head(as.data.frame(x)).

Value

An object of the same class as x.

Author(s)

Adrian Baddeley [e-mail], Rolf Turner [e-mail] and Ege Rubak [e-mail].

See Also

View, edit.

Conversion to data frame: as.data.frame.ppp, as.data.frame.ppx, as.data.frame.psp

Examples

  head(cells)
  tail(edges(letterR), 5)
  head(dirichlet(cells), 4)