is.subset.owin {spatstat.geom} | R Documentation |
Determine Whether One Window is Contained In Another
Description
Tests whether window A
is a subset of window B
.
Usage
is.subset.owin(A, B)
Arguments
A |
A window object (see Details). |
B |
A window object (see Details). |
Details
This function tests whether the window A
is a subset
of the window B
.
The arguments A
and B
must be window objects
(either objects of class "owin"
, or data that can be
coerced to this class by as.owin
).
Various algorithms are used, depending on the geometrical type of the two windows.
Note that if B
is not rectangular, the algorithm proceeds by
discretising A
, converting it to a pixel mask using
as.mask
. In this case the resulting
answer is only “approximately correct”. The accuracy of the
approximation can be controlled: see as.mask
.
Value
Logical scalar; TRUE
if A
is a sub-window of B
,
otherwise FALSE
.
Author(s)
Adrian Baddeley Adrian.Baddeley@curtin.edu.au
and Rolf Turner rolfturner@posteo.net
Examples
w1 <- as.owin(c(0,1,0,1))
w2 <- as.owin(c(-1,2,-1,2))
is.subset.owin(w1,w2) # Returns TRUE.
is.subset.owin(w2,w1) # Returns FALSE.