ppp.object
From spatstat v1.0-1
by Adrian Baddeley
Class of Point Patterns
A class "ppp"
to represent a two-dimensional point
pattern. Includes information about the window in which the
pattern was observed. Optionally includes marks.
- Keywords
- spatial
Details
This class represents a two-dimensional point pattern dataset. It specifies
- the locations of the points
- the window in which the pattern was observed
- optionally, a ``mark'' attached to each point (extra information such as a type label).
code
tabular
ll
tab
vector of $x$ coordinates of data points
y
vector of $y$ coordinates of data points
n
number of points
window
window of observation
(an object of class owin
)
marks
optional vector of marks
Warnings
The internal representation of marks is likely to change in the next release of this package.
See Also
Examples
library(spatstat)
x <- runif(100)
y <- runif(100)
X <- ppp(x, y, c(0,1),c(0,1))
plot(X)
mar <- sample(1:3, 100, replace=T)
mm <- ppp(x, y, c(0,1), c(0,1), marks=mar)
plot(mm)
# points with mark equal to 2
ss <- mm[ mm$marks == 2 , ]
plot(ss)
# left half of pattern 'mm'
lu <- owin(c(0,0.5),c(0,1))
mmleft <- mm[ , lu]
plot(mmleft)
# input data from file
qq <- scanpp("my.table", unit.square())
# interactively build a point pattern
plot(unit.square())
X <- as.ppp(locator(10), unit.square())
plot(X)
Community examples
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