has.close: Check Whether Points Have Close Neighbours

In spatstat.geom: Geometrical Functionality of the 'spatstat' Family

Check Whether Points Have Close Neighbours

Description

For each point in a point pattern, determine whether the point has a close neighbour in the same pattern.

Usage

  has.close(X, r, Y=NULL, ...)

  ## Default S3 method:
has.close(X,r, Y=NULL, ..., periodic=FALSE)

  ## S3 method for class 'ppp'
has.close(X,r, Y=NULL, ..., periodic=FALSE, sorted=FALSE)

  ## S3 method for class 'pp3'
has.close(X,r, Y=NULL, ..., periodic=FALSE, sorted=FALSE)

Arguments

X, Y	Point patterns of class "ppp" or "pp3" or "lpp".
r	Threshold distance: a number greater than zero.
periodic	Logical value indicating whether to measure distances in the periodic sense, so that opposite sides of the (rectangular) window are treated as identical.
sorted	Logical value, indicating whether the points of X (and Y, if given) are already sorted into increasing order of the x coordinates.
...	Other arguments are ignored.

Details

This is simply a faster version of (nndist(X) <= r) or (nncross(X,Y,what="dist") <= r).

has.close(X,r) determines, for each point in the pattern X, whether or not this point has a neighbour in the same pattern X which lies at a distance less than or equal to r.

has.close(X,r,Y) determines, for each point in the pattern X, whether or not this point has a neighbour in the other pattern Y which lies at a distance less than or equal to r.

The function has.close is generic, with methods for "ppp" and "pp3" and a default method.

Value

A logical vector, with one entry for each point of X.

Author(s)

\adrian

.

See Also

nndist

Examples

  has.close(redwood, 0.05)
  with(split(amacrine), has.close(on, 0.05, off))
  with(osteo, sum(has.close(pts, 20)))

spatstat.geom documentation built on Sept. 18, 2024, 9:08 a.m.