test.crossing.psp: Check Whether Segments Cross

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

Check Whether Segments Cross

Description

Determine whether there is a crossing (intersection) between each pair of line segments.

Usage

test.crossing.psp(A, B)
test.selfcrossing.psp(A)

Arguments

A,B	Line segment patterns (objects of class "psp").

Details

These functions decide whether the given line segments intersect each other.

If A and B are two spatial patterns of line segments, test.crossing.psp(A, B) returns a logical matrix in which the entry on row i, column j is equal to TRUE if segment A[i] has an intersection with segment B[j].

If A is a pattern of line segments, test.selfcross.psp(A) returns a symmetric logical matrix in which the entry on row i, column j is equal to TRUE if segment A[i] has an intersection with segment A[j].

Value

A logical matrix.

Author(s)

\spatstatAuthors

.

See Also

psp

Examples

  B <- edges(letterR)
if(require(spatstat.random)) {
  A <- rpoisline(5, Frame(B))
} else {
  FB <- Frame(B)
  A <- as.psp(from=runifrect(5, FB), to=runifrect(5, FB))
}
  MA <- test.selfcrossing.psp(A)
  MAB <- test.crossing.psp(A, B)

spatstat.geom documentation built on Oct. 20, 2023, 9:06 a.m.