pairdist(X, ..., method="C")
pairdist.ppp(X, ..., method="C")
pairdist.default(X, Y=NULL, ..., method="C")
pairdist.ppp
, the argument X
should be a point
pattern (object of class "ppp"
).
For pairdist.default
, typically X
and <pairdist.ppp
and pairdist.default
."C"
and "interpreted"
.
Usually not specified.[i,j]
entry is the distance
between the points numbered i
and j
. The function pairdist
is generic, with
a method for point patterns (objects of class "ppp"
)
and a default method.
The method for point patterns expects a single
point pattern argument X
and returns the matrix of its
pairwise distances.
The default method expects that X
and Y
will determine
the coordinates of a set of points. Typically X
and
Y
would be numeric vectors of equal length. Alternatively
Y
may be omitted and X
may be a list with two components
named x
and y
, or a matrix or data frame with two columns.
The argument method
is not normally used. It is
retained only for checking the validity of the software.
If method = "interpreted"
then the distances are
computed using interpreted R code only. If method="C"
(the default) then C code is used. The C code is somewhat faster.
crossdist
,
nndist
,
Kest
data(cells)
d <- pairdist(cells)
x <- runif(100)
y <- runif(100)
d <- pairdist(x, y)
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