coords
Extract or Change Coordinates of a Spatial or Spatiotemporal Point Pattern
Given any kind of spatial or space-time point pattern, this function extracts the (space and/or time and/or local) coordinates of the points and returns them as a data frame.
Usage
coords(x, ...)
# S3 method for ppp
coords(x, ...)
# S3 method for ppx
coords(x, ..., spatial = TRUE, temporal = TRUE, local=TRUE)
coords(x, ...) <- value
# S3 method for ppp
coords(x, ...) <- value
# S3 method for ppx
coords(x, ..., spatial = TRUE, temporal = TRUE, local=TRUE) <- value
# S3 method for quad
coords(x, ...)Arguments
- x
A point pattern: either a two-dimensional point pattern (object of class
"ppp"), a three-dimensional point pattern (object of class"pp3"), or a general multidimensional space-time point pattern (object of class"ppx") or a quadrature scheme (object of class"quad").- …
Further arguments passed to methods.
- spatial,temporal,local
Logical values indicating whether to extract spatial, temporal and local coordinates, respectively. The default is to return all such coordinates. (Only relevant to
ppxobjects).- value
New values of the coordinates. A numeric vector with one entry for each point in
x, or a numeric matrix or data frame with one row for each point inx.
Details
The function coords extracts the coordinates from
a point pattern. The function coords<- replaces the coordinates
of the point pattern with new values.
Both functions coords and coords<- are generic, with methods for
the classes "ppp") and "ppx".
An object of class "pp3" also inherits from "ppx" and
is handled by the method for "ppx".
Value
coords returns a data.frame with one row for each point,
containing the coordinates.
coords<- returns the altered point pattern.
See Also
Examples
# NOT RUN {
df <- data.frame(x=runif(4),y=runif(4),t=runif(4))
X <- ppx(data=df, coord.type=c("s","s","t"))
coords(X)
coords(X, temporal=FALSE)
coords(X) <- matrix(runif(12), ncol=3)
# }