unique.ppp.R
#
# unique.ppp.R
#
# $Revision: 1.11 $ $Date: 2007/11/12 13:26:46 $
#
unique.ppp <- function(x, ...) {
verifyclass(x, "ppp")
dupe <- duplicated.ppp(x)
return(x[!dupe])
}
duplicated.ppp <- function(x, ...) {
verifyclass(x, "ppp")
n <- x$n
# marked points - split by mark value
if(is.marked(x)) {
m <- marks(x)
um <- if(is.factor(m)) levels(m) else unique(m)
xx <- unmark(x)
result <- logical(n)
for(i in seq(um)) {
sub <- (m == um[i])
result[sub] <- duplicated.ppp(xx[sub])
}
return(result)
}
# unmarked points
# check for duplication of x and y separately (a necessary condition)
xx <- x$x
yy <- x$y
possible <- duplicated(xx) & duplicated(yy)
if(!any(possible))
return(possible)
# split by x coordinate of duplicated x values
result <- possible
xvals <- unique(xx[possible])
for(xvalue in xvals) {
sub <- (xx == xvalue)
# compare y values
result[sub] <- duplicated(yy[sub])
}
return(result)
}
multiplicity.ppp <- function(x) {
verifyclass(x, "ppp")
xx <- x$x
yy <- x$y
equal <- outer(xx, xx, "==") & outer(yy, yy, "==")
if(is.marked(x)) {
marx <- marks(x, dfok=FALSE)
equal <- equal & outer(marx, marx, "==")
}
return(matrowsum(equal))
}