## S3 method for class 'ppx':
[(x, i, drop=FALSE, ...)
"ppx"
)."boxx"
or "box3"
."ppx"
). The function [.ppx
is a method for [
for the
class "ppx"
. It extracts a designated subset of a point pattern.
The argument i
may be either
x
. In the latter case,
the points(x$x[i], x$y[i])
for whichsubset[i]=TRUE
will be retained, and the others
will be deleted."boxx"
or"box3"
.
Points falling inside this region will be retained.drop
determines whether to remove
unused levels of a factor, if the point pattern is multitype
(i.e. the marks are a factor) or if the marks are a data frame or hyperframe
in which some of the columns are factors. Use the function unmark
to remove marks from a
marked point pattern.
ppx
df <- data.frame(x=runif(4),y=runif(4),z=runif(4))
X <- ppx(data=df, coord.type=c("s","s","t"))
X[-2]
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