https://github.com/cran/spatstat
Tip revision: 07a978966c1fa51f9be1df78ac71e335c091bb7a authored by Adrian Baddeley on 10 May 2005, 15:21:58 UTC
version 1.6-6
version 1.6-6
Tip revision: 07a9789
superimpose.R
# superimpose.R
#
# $Revision: 1.4 $ $Date: 2004/08/26 08:36:55 $
#
# This has been taken out of ppp.S
#
#############################
"superimpose" <-
function(...)
{
# superimpose any number of point patterns
# ASSUMED TO BE IN THE SAME WINDOW
arglist <- list(...)
if(length(arglist) == 1 && inherits(arglist[[1]], "list"))
arglist <- arglist[[1]]
# concatenate lists of (x,y) coordinates
XY <- do.call("concatxy", arglist)
# determine window
P <- arglist[[1]]
if(!verifyclass(P, "ppp", fatal=FALSE))
stop("The first argument is not a point pattern object")
OUT <- ppp(XY$x, XY$y, window=P$window)
# find out whether the arguments are marked patterns
Mlist <- lapply(arglist, function(x) {x$marks})
ismarked <- !unlist(lapply(Mlist, is.null))
isfactor <- unlist(lapply(Mlist, is.factor))
if(any(ismarked) && !all(ismarked))
warning("Some, but not all, patterns contain marks -- ignored.")
if(any(isfactor) && !all(isfactor))
stop("Patterns have incompatible marks - some are factors, some are not")
if(!all(ismarked)) {
# Assume all patterns unmarked.
# If patterns are not named, return the superimposed point pattern.
nama <- names(arglist)
if(is.null(nama) || any(nama == ""))
return(OUT)
# Patterns are named. Make marks from names.
len <- unlist(lapply(arglist, function(x) { x$n }))
M <- factor(rep(nama, len), levels=nama)
OUT <- OUT %mark% M
return(OUT)
}
# All patterns are marked.
# Concatenate vectors of marks
if(!all(isfactor))
# continuous marks
M <- unlist(Mlist)
else {
# multitype
Llist <- lapply(Mlist, levels)
lev <- unique(unlist(Llist))
codesof <- function(x, lev) { as.integer(factor(x, levels=lev)) }
Mlist <- lapply(Mlist, codesof, lev=lev)
M <- factor(unlist(Mlist), levels=codesof(lev,lev), labels=lev)
}
OUT <- OUT %mark% M
return(OUT)
}