as.owin
From spatstat v1.6-11
by Adrian Baddeley
Convert Data To Class owin
Converts data specifying an observation window
in any of several formats, into an object of class "owin"
.
- Keywords
- spatial
Usage
as.owin(W)
Arguments
- W
- Data specifying an observation window, in any of several formats described under Details below.
Details
The class "owin"
is a way of specifying the observation window
for a point pattern. See owin.object
for an overview.
This function converts data in any of several formats
into an object of class "owin"
for use by the spatstat
package. The argument W
may be
- an object of class
"owin"
- a structure with entries
xrange
,yrange
specifying the$x$and$y$dimensions of a rectangle - a four-element vector
(interpreted as
(xmin, xmax, ymin, ymax)
) specifying the$x$and$y$dimensions of a rectangle - a structure with entries
xl
,xu
,yl
,yu
specifying the$x$and$y$dimensions of a rectangle as(xmin, xmax) = (xl, xu)
and(ymin, ymax) = (yl, yu)
. This will accept objects of classspp
used in the Venables and Ripleyspatial
library. - an object of class
"ppp"
representing a point pattern. In this case, the object'swindow
structure will be extracted. - an object of class
"im"
representing a pixel image. In this case, a window of type"mask"
will be returned, with the same pixel raster coordinates as the image. An image pixel value ofNA
, signifying that the pixel lies outside the window, is transformed into the logical valueFALSE
, which is the corresponding convention for window masks.
Value
- An object of class
"owin"
(seeowin.object
) specifying an observation window.
See Also
Examples
w <- as.owin(c(0,1,0,1))
w <- as.owin(list(xrange=c(0,5),yrange=c(0,10)))
# point pattern
data(demopat)
w <- as.owin(demopat)
# image
Z <- as.im(function(x,y) { x + 3}, unit.square())
w <- as.owin(Z)
# Venables & Ripley 'spatial' package
require(spatial)
towns <- ppinit("towns.dat")
w <- as.owin(towns)
detach(package:spatial)
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