spatstat.geom (version 3.3-3)

headtail: 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 ppp
head(x, n = 6L, ...)
  # S3 method for ppx
head(x, n = 6L, ...)
  # S3 method for psp
head(x, n = 6L, ...)
  # S3 method for tess
head(x, n = 6L, ...)
  # S3 method for ppp
tail(x, n = 6L, ...)
  # S3 method for ppx
tail(x, n = 6L, ...)
  # S3 method for psp
tail(x, n = 6L, ...)
  # S3 method for tess
tail(x, n = 6L, ...)

Value

An object of the same class as x.

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.

Author

Adrian Baddeley , Rolf Turner and Ege Rubak .

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)).

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)