Marks of a Point Pattern
Extract or change the marks attached to a point pattern dataset.
marks(x, ...) ## S3 method for class 'ppp' marks(x, ..., dfok=TRUE, drop=TRUE) ## S3 method for class 'ppx' marks(x, ..., drop=TRUE) marks(x, ...) <- value ## S3 replacement method for class 'ppp' marks(x, ..., dfok=TRUE, drop=TRUE) <- value ## S3 replacement method for class 'ppx' marks(x, ...) <- value setmarks(x, value) x %mark% value
x |
Point pattern dataset (object of class |
... |
Ignored. |
dfok |
Logical. If |
drop |
Logical. If |
value |
Replacement value. A vector, data frame or hyperframe of mark values,
or |
These functions extract or change the marks
attached to the points of the point pattern x.
The expression marks(x) extracts the marks of x.
The assignment marks(x) <- value assigns new marks to the
dataset x, and updates the dataset x in the current
environment. The expression setmarks(x,value)
or equivalently x %mark% value returns a point pattern
obtained by replacing the marks of x by value, but does
not change the dataset x itself.
For point patterns in two-dimensional space (objects of class
"ppp") the marks can be a vector, a factor, or a data frame.
For general point patterns (objects of class "ppx") the marks can be a vector, a factor, a data frame or a hyperframe.
For the assignment marks(x) <- value, the value
should be a vector or factor of length equal to the number of
points in x, or a data frame or hyperframe with as many rows
as there are points in x. If value is a single value,
or a data frame or hyperframe with one row, then it will be replicated
so that the same marks will be attached to each point.
To remove marks, use marks(x) <- NULL or
unmark(x).
For marks(x), the result is a vector, factor, data frame or hyperframe,
containing the mark values attached to the points of x.
For marks(x) <- value, the result is the updated point pattern
x (with the side-effect that the dataset x is updated in
the current environment).
For setmarks(x,value) and x %mark% value, the return value
is the point pattern obtained by replacing the
marks of x by value.
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner r.turner@auckland.ac.nz and Ege Rubak rubak@math.aau.dk
X <- amacrine # extract marks m <- marks(X) # recode the mark values "off", "on" as 0, 1 marks(X) <- as.integer(m == "on")
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