crossdist(X, Y, ..., method="C")
crossdist.ppp(X, Y, ..., method="C")
crossdist.default(X, Y, x2, y2, ..., method="C")
crossdist.ppp
, the arguments X
and Y
should be point patterns (objects of class "ppp"
).
For crossdist.default
, the arguments X
and Y
should be numercrossdist.default
, these
should be numeric vectors of equal length specifying the location of
the second point pattern.crossdist.ppp
and crossdist.default
."C"
and "interpreted"
.[i,j]
entry is the distance
from the i
-th point in the first pattern
to the j
-th point in the second pattern. The function crossdist
is generic, with
a method for point patterns (objects of class "ppp"
)
and a default method.
The method for point patterns expects two
point patterns X
and Y
, and returns the matrix
whose [i,j]
entry is the distance from X[i]
to
Y[j]
.
The default method expects X
and Y
to be numeric vectors
of equal length specifying the coordinates of the first point pattern.
The arguments x2
,y2
specify the coordinates of the
second point pattern.
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 faster by a factor of 4.
pairdist
,
nndist
,
Gest
data(cells)
d <- crossdist(cells, runifpoint(6))
d <- crossdist(runif(7), runif(7), runif(12), runif(12))
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