Description Usage Arguments Details Value Author(s) See Also Examples

Finds any crossing points between two line segment patterns.

1 | ```
crossing.psp(A,B,fatal=TRUE,details=FALSE)
``` |

`A,B` |
Line segment patterns (objects of class |

`details` |
Logical value indicating whether to return additional information. See below. |

`fatal` |
Logical value indicating what to do
if the windows of |

This function finds any crossing points between
the line segment patterns `A`

and `B`

.

A crossing point occurs whenever one of the line segments in `A`

intersects one of the line segments in `B`

, at a nonzero
angle of intersection.

The result is a point pattern consisting of all the intersection points.

If `details=TRUE`

, additional information is computed,
specifying where each intersection point came from.
The resulting point pattern has a data frame of marks, with columns
named `iA, jB, tA, tB`

. The marks `iA`

and `jB`

are the indices of the line segments in `A`

and
`B`

, respectively, which produced each intersection point.
The marks `tA`

and `tB`

are numbers between 0 and 1
specifying the position of the intersection point along the
original segments.

If the windows `Window(A)`

and `Window(B)`

do not
overlap, then an error will be reported if `fatal=TRUE`

,
while if `fatal=FALSE`

an error will not occur
and the result will be `NULL`

.

Point pattern (object of class `"ppp"`

).

and \rolf

`selfcrossing.psp`

,
`psp.object`

,
`ppp.object`

.

1 2 3 4 5 6 7 | ```
a <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
b <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
plot(a, col="green", main="crossing.psp")
plot(b, add=TRUE, col="blue")
P <- crossing.psp(a,b)
plot(P, add=TRUE, col="red")
as.data.frame(crossing.psp(a,b,details=TRUE))
``` |

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