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##
## Copyright (c) 2007 Felix Andrews <felix@nfrac.org>
## GPL version 2 or newer
xyplot.list <-
function(x, data = NULL, ..., FUN = xyplot,
y.same = TRUE, x.same = NA, layout = NULL,
merge.legends = FALSE)
{
if (length(x) == 0) return(NULL)
## NOTE lapply here causes problems with eval.parent and `...` later.
#objs <- lapply(x, FUN, data = data, ...)
objs <- vector(mode = "list", length = length(x))
for (i in as.numeric(seq_along(x))) {
## this is what we had previously, but it seemed to cause failures
## in complex call structures (e.g. pch=pch ==> object 'pch' not found)
## (use substitute to get reasonable ylab)
#objs[[i]] <- eval.parent(substitute(FUN(x[[i]], data = data, ...)))
## check for 'data' to avoid warnings in e.g. qqmath.numeric
objs[[i]] <-
if (!is.null(data)) FUN(x[[i]], data = data, ...) else FUN(x[[i]], ...)
}
names(objs) <- names(x)
ok <- unlist(lapply(objs, inherits, "trellis"))
if (any(!ok))
stop("FUN returned object of class ",
toString(class(objs[[ which(!ok)[1] ]])),
", not trellis.")
ans <- do.call("c", c(objs,
list(x.same = x.same, y.same = y.same,
layout = layout, merge.legends = merge.legends)))
ans$call <- match.call()
ans
}
c.trellis <-
function(..., x.same = NA, y.same = NA,
layout = NULL, merge.legends = FALSE,
recursive = FALSE)
{
objs <- list(...)
if (length(objs) == 0) return(NULL)
if (length(objs) == 1) {
## only one object
obj <- objs[[1]]
## set dimnames if given and only one panel
if (!is.null(names(objs)) && (prod(dim(obj)) == 1))
rownames(obj) <- names(objs)
return(obj)
}
if (length(objs) > 2) {
## merge first two objects, and call again
first2Merged <-
do.call("c.trellis", c(objs[1:2],
list(x.same = x.same, y.same = y.same,
merge.legends = merge.legends)))
return(do.call("c.trellis", c(list(first2Merged), objs[-(1:2)],
list(x.same = x.same, y.same = y.same,
layout = layout, merge.legends = merge.legends))))
}
## now exactly 2 objects
obj1 <- objs[[1]]
obj2 <- objs[[2]]
## number of packets in object, i.e. offset
NPACK1 <- prod(dim(obj1))
NPACK2 <- prod(dim(obj2))
## first panel function
panel <- obj1$panel
PANEL1 <- if (is.function(panel)) panel
else if (is.character(panel)) get(panel)
else eval(panel)
## second panel function
panel <- obj2$panel
PANEL2 <- if (is.function(panel)) panel
else if (is.character(panel)) get(panel)
else eval(panel)
obj1$panel <- function(...) {
if (packet.number() <= NPACK1)
PANEL1(...)
else PANEL2(...)
}
## TODO: treat 'prepanel' the same way as 'panel'?
## flatten the trellis objects (make 1 dimensional)
flatIC <- function(index.cond) {
dim <- sapply(index.cond, length)
ic <- do.call(expand.grid, index.cond)
if (length(dim) >= 2)
ic[,2] <- (ic[,2] - 1) * dim[1]
if (length(dim) >= 3)
ic[,3] <- (ic[,3] - 1) * prod(dim[1:2])
rowSums(ic)
}
flatCL <- function(condlevels, newname=NULL) {
## paste names of variables to their values (for strips)
#for (i in seq_along(condlevels))
# condlevels[[i]] <- paste(names(condlevels)[i], ## may be NULL
# condlevels[[i]], sep=" = ")
## convert shingle levels to character strings
condlevels <- lapply(condlevels, as.character)
cl <- do.call(expand.grid, condlevels)
cl <- apply(cl, 1, paste, sep=" / ")
if (!is.null(newname) && (nchar(newname) > 0)) {
if (length(cl) == 1) cl <- newname
else cl <- paste(newname, cl, sep=": ")
}
cl
}
obj1$index.cond <- list(c(flatIC(obj1$index.cond),
flatIC(obj2$index.cond) + NPACK1))
obj1$condlevels <- list(c(flatCL(obj1$condlevels, names(objs)[1]),
flatCL(obj2$condlevels, names(objs)[2])))
obj1$perm.cond <- 1
## make scales nominally "free", so they look like original objects
makeFreeScales <- function(obj, npack, x.y)
{
obj[[paste(x.y, "scales", sep=".")]]$relation <- "free"
.limits <- paste(x.y, "limits", sep=".")
.num.limit <- paste(x.y, "num.limit", sep=".")
.used.at <- paste(x.y, "used.at", sep=".")
if (is.null(obj[[.limits]])) obj[[.limits]] <- NA
if (is.null(obj[[.num.limit]])) obj[[.num.limit]] <- NA
if (is.null(obj[[.used.at]])) obj[[.used.at]] <- NA
if (!is.list(obj[[.limits]])) {
obj[[.limits]] <- rep(list(obj[[.limits]]), length=npack)
obj[[.num.limit]] <- rep(list(obj[[.num.limit]]), length=npack)
obj[[.used.at]] <- rep(list(obj[[.used.at]]), length=npack)
}
obj
}
## set relations to "free" if the first object has "free" scales
## or if the limits in the two objects are not identical
xlimItems <- c("x.limits", "x.num.limit", "x.used.at")
ylimItems <- c("y.limits", "y.num.limit", "y.used.at")
if (is.na(x.same)) {
x.same <- FALSE
if (!is.list(obj1$x.limits) &&
identical(unclass(obj1)[xlimItems],
unclass(obj2)[xlimItems]))
x.same <- NA
}
if (is.na(y.same)) {
y.same <- FALSE
if (!is.list(obj1$y.limits) &&
identical(unclass(obj1)[ylimItems],
unclass(obj2)[ylimItems]))
y.same <- NA
}
if (identical(x.same, FALSE) ||
is.list(obj1$x.limits))
{
obj1 <- makeFreeScales(obj1, npack=NPACK1, x.y="x")
obj2 <- makeFreeScales(obj2, npack=NPACK2, x.y="x")
obj1$x.limits <- c(obj1$x.limits, obj2$x.limits)
obj1$x.num.limit <- c(obj1$x.num.limit, obj2$x.num.limit)
obj1$x.used.at <- c(obj1$x.used.at, obj2$x.used.at)
}
if (identical(y.same, FALSE) ||
is.list(obj1$y.limits))
{
obj1 <- makeFreeScales(obj1, npack=NPACK1, x.y="y")
obj2 <- makeFreeScales(obj2, npack=NPACK2, x.y="y")
obj1$y.limits <- c(obj1$y.limits, obj2$y.limits)
obj1$y.num.limit <- c(obj1$y.num.limit, obj2$y.num.limit)
obj1$y.used.at <- c(obj1$y.used.at, obj2$y.used.at)
}
## merge common panel args into panel.args
## check for identical() args
commonNames <- intersect(names(obj1$panel.args.common),
names(obj2$panel.args.common))
identNames <- commonNames[unlist(lapply(commonNames, function(x)
identical(obj1$panel.args.common[[x]],
obj2$panel.args.common[[x]])))]
obj1Common <- names(obj1$panel.args.common) %in% identNames
obj2Common <- names(obj2$panel.args.common) %in% identNames
obj1$panel.args <- lapply(obj1$panel.args, c,
obj1$panel.args.common[!obj1Common])
obj2$panel.args <- lapply(obj2$panel.args, c,
obj2$panel.args.common[!obj2Common])
obj1$panel.args.common <- obj1$panel.args.common[obj1Common]
## the actual data
obj1$panel.args <- c(obj1$panel.args, obj2$panel.args)
obj1$packet.sizes <- c(obj1$packet.sizes, obj2$packet.sizes)
## some prepanel functions require a 'subscripts' argument in each 'panel.args'
if ("subscripts" %in% c(names(formals(obj1$prepanel.default)),
names(formals(obj1$prepanel)))) {
for (i in seq_along(obj1$panel.args)) {
if ("subscripts" %in% names(obj1$panel.args[[i]]) == FALSE) {
obj1$panel.args[[i]]$subscripts <- TRUE
}
}
}
## recalculate panel limits using all data
if ((isTRUE(x.same) || isTRUE(y.same))) {
scalesSpec <- list()
if (isTRUE(x.same)) scalesSpec$x$relation <- "same"
if (isTRUE(y.same)) scalesSpec$y$relation <- "same"
obj1 <- update(obj1, scales = scalesSpec)
}
if (identical(obj1$strip.left, FALSE)) {
## turn strips on if either object has strips, or names were given
if (identical(obj1$strip, FALSE) &&
!identical(obj2$strip, FALSE))
obj1$strip <- obj2$strip
if (identical(obj1$strip, FALSE) &&
!is.null(names(objs)))
obj1$strip <- "strip.default"
}
## TODO: can use 'par.settings' from obj2 only for obj2 panels?
obj1$par.settings <- modifyList(as.list(obj2$par.settings),
as.list(obj1$par.settings))
if (merge.legends)
obj1$legend <- mergeTrellisLegends(obj1$legend, obj2$legend)
obj1$layout <- layout
obj1$call <- call("c", obj1$call, obj2$call,
x.same = x.same, y.same = y.same,
layout = layout)
## need this to allow further calls to update() to insert arguments:
obj1$call <- call("update", obj1$call)
obj1
}
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