intersect.owin
From spatstat v1.23-2
by Adrian Baddeley
Intersection, Union or Set Subtraction of Two Windows
Yields the intersection, union or set subtraction of two windows.
Usage
intersect.owin(A, B, ..., fatal=TRUE)
union.owin(A,B, ...)
setminus.owin(A,B, ...)
Arguments
- A
- A window object (see Details).
- B
- A window object.
- ...
- Optional arguments passed to
as.mask
to control the discretisation, if required. - fatal
- Logical. Determines what happens if the intersection is empty.
Details
The function intersect.owin
computes the intersection between the
two windows A
and B
, while
union.owin
computes their union.
The function setminus.owin
computes the intersection of
A
with the complement of 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
).
If the intersection is empty, then if fatal=FALSE
the result is NULL, while if fatal=TRUE
an error occurs.
The intersection or union of more than two windows can also be
computed. For intersect.owin
and union.owin
the
arguments ...
can include additional window objects.
Value
- A window (object of class
"owin"
).
See Also
Examples
# rectangles
u <- unit.square()
v <- owin(c(0.5,3.5), c(0.4,2.5))
# polygon
data(letterR)
# mask
m <- as.mask(letterR)
# two rectangles
intersect.owin(u, v)
union.owin(u,v)
setminus.owin(u,v)
# polygon and rectangle
intersect.owin(letterR, v)
union.owin(letterR,v)
setminus.owin(letterR,v)
# mask and rectangle
intersect.owin(m, v)
union.owin(m,v)
setminus.owin(m,v)
# mask and polygon
p <- rotate(v, 0.2)
intersect.owin(m, p)
union.owin(m,p)
setminus.owin(m,p)
# two polygons
A <- letterR
B <- rotate(letterR, 0.2)
plot(bounding.box(A,B), main="intersection")
w <- intersect.owin(A, B)
plot(w, add=TRUE, col="lightblue")
plot(A, add=TRUE)
plot(B, add=TRUE)
plot(bounding.box(A,B), main="union")
w <- union.owin(A,B)
plot(w, add=TRUE, col="lightblue")
plot(A, add=TRUE)
plot(B, add=TRUE)
plot(bounding.box(A,B), main="set minus")
w <- setminus.owin(A,B)
plot(w, add=TRUE, col="lightblue")
plot(A, add=TRUE)
plot(B, add=TRUE)
# intersection and union of three windows
C <- shift(B, c(0.2, 0.3))
plot(union.owin(A,B,C))
plot(intersect.owin(A,B,C))
Community examples
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