| Extract.ppx {spatstat} | R Documentation |
Extract a subset of a multidimensional point pattern.
## S3 method for class 'ppx' x[i, ...]
x |
A multidimensional point pattern (object of class |
i |
Subset index. A valid subset index in the usual R sense, indicating which points should be retained. |
... |
Ignored. |
This function extracts a designated subset of a multidimensional point pattern.
The function [.ppx is a method for [ for the
class "ppx". It extracts a designated subset of a point pattern.
The argument i should be a subset index in the usual R sense:
either a numeric vector
of positive indices (identifying the points to be retained),
a numeric vector of negative indices (identifying the points
to be deleted) or a logical vector of length equal to the number of
points in the point pattern x. In the latter case,
the points (x$x[i], x$y[i]) for which
subset[i]=TRUE will be retained, and the others
will be deleted.
Use the function unmark to remove marks from a
marked point pattern.
A multidimensional point pattern (of class "ppx")
in the same domain.
Adrian Baddeley Adrian.Baddeley@uwa.edu.au http://www.maths.uwa.edu.au/~adrian/ and Rolf Turner r.turner@auckland.ac.nz
df <- data.frame(x=runif(4),y=runif(4),z=runif(4))
X <- ppx(data=df, coord.type=c("s","s","t"))
X[-2]