https://github.com/cran/spatstat
Tip revision: 699c3464503628aaa08dad3b056b3300812493ee authored by Adrian Baddeley on 24 May 2004, 19:39:24 UTC
version 1.4-6
version 1.4-6
Tip revision: 699c346
fv.R
#
#
# fv.R
#
# class "fv" of function value objects
#
# $Revision: 1.9 $ $Date: 2004/01/13 13:09:29 $
#
#
# An "fv" object represents one or more related functions
# of the same argument, such as different estimates of the K function.
#
# It is a data.frame with additional attributes
#
# argu column name of the function argument (typically "r")
#
# valu column name of the recommended function
#
# ylab generic label for y axis e.g. K(r)
#
# fmla default plot formula
#
# alim recommended range of function argument
#
# labl recommended xlab/ylab for each column
#
# desc longer description for each column
#
# Objects of this class are returned by Kest(), etc
#
##################################################################
# creator
fv <- function(x, argu="r", ylab=NULL, valu, fmla=NULL,
alim=NULL, labl=names(x), desc=NULL) {
stopifnot(is.data.frame(x))
# check arguments
stopifnot(is.character(argu))
if(!is.null(ylab)) stopifnot(is.character(ylab))
stopifnot(is.character(valu))
if(!(argu %in% names(x)))
stop("\`argu\' must be the name of a column of x")
if(!(valu %in% names(x)))
stop("\`valu\' must be the name of a column of x")
if(is.null(fmla))
fmla <- as.formula(paste(valu, "~", argu))
else if(!inherits(fmla, "formula"))
stop("\`fmla\' should be a formula")
if(is.null(alim)) {
argue <- x[[argu]]
xlim <- range(argue[is.finite(argue)], na.rm=TRUE)
}
if(!is.numeric(alim) || length(alim) != 2)
stop("\`alim\' should be a vector of length 2")
if(!is.character(labl))
stop("\`labl\' should be a vector of strings")
stopifnot(length(labl) == ncol(x))
if(is.null(desc))
desc <- character(ncol(x))
else {
stopifnot(is.character(desc))
stopifnot(length(desc) == ncol(x))
nbg <- is.na(desc)
if(any(nbg)) desc[nbg] <- ""
}
# pack attributes
attr(x, "argu") <- argu
attr(x, "valu") <- valu
attr(x, "ylab") <- ylab
attr(x, "fmla") <- fmla
attr(x, "alim") <- alim
attr(x, "labl") <- labl
attr(x, "desc") <- desc
#
class(x) <- c("fv", class(x))
return(x)
}
is.fv <- function(x) {
inherits(x, "fv")
}
as.fv <- function(x) {
if(is.fv(x))
return(x)
else if(inherits(x, "data.frame"))
return(fv(x, names(x)[1], , names(x)[2]))
else if(inherits(x, "fasp") && length(which) == 1)
return(x$funs[[1]])
else
stop("Don't know how to convert this to an \"fv\" object")
}
print.fv <- function(x, ...) {
verifyclass(x, "fv")
nama <- names(x)
a <- attributes(x)
cat("Function value object (class \"fv\")\n")
if(!is.null(a$ylab))
cat(paste("for the function", a$argu, "->", a$ylab, "\n"))
cat("Entries:\n")
len <- nchar(a$labl)
tabjump <- max(c(len, 5)) + 3
pad <- function(n) { paste(character(n),collapse=" ") }
cat("id\tlabel", pad(tabjump - 5), "description\n", sep="")
cat("--\t-----", pad(tabjump - 5), "-----------\n", sep="")
for(j in seq(ncol(x)))
cat(paste(nama[j],"\t",
a$labl[j],pad(tabjump - len[j]),
a$desc[j],"\n", sep=""))
cat("--------------------------------------\n\n")
cat("Default plot formula:\n\t")
print.formula(a$fmla)
cat(paste("\nRecommended range of argument ", a$argu,
": [", a$alim[1], ", ", a$alim[2], "]\n", sep=""))
invisible(NULL)
}
bind.fv <- function(x, y, labl, desc, preferred) {
verifyclass(x, "fv")
y <- as.data.frame(y)
a <- attributes(x)
if(length(labl) != ncol(y))
stop("length of \`labl\' does not match number of columns of y")
if(missing(desc) || is.null(desc))
desc <- character(ncol(y))
else if(length(desc) != ncol(y))
stop("length of \`desc\' does not match number of columns of y")
if(missing(preferred))
preferred <- a$valu
xy <- cbind(as.data.frame(x), y)
z <- fv(xy, a$argu, a$ylab, preferred, a$fmla, a$alim,
c(attr(x, "labl"), labl),
c(attr(x, "desc"), desc))
return(z)
}
"[.fv" <- subset.fv <- function(x, i, j, ..., drop=FALSE)
{
Nindices <- !missing(i) + !missing(j)
if(Nindices == 0)
return(x)
y <- as.data.frame(x)
if(Nindices == 2)
z <- y[i, j, drop=FALSE]
else if(!missing(i))
z <- y[i, , drop=FALSE]
else
z <- y[ , j, drop=FALSE]
nama <- names(z)
argu <- attr(x, "argu")
if(!(argu %in% nama))
stop(paste("The function argument \`", argu, "\' must not be removed",
sep=""))
valu <- attr(x, "valu")
if(!(valu %in% nama))
stop(paste("The default column of function values \'", valu,
"\' must not be removed"))
# If range of argument was implicitly changed, adjust "alim"
alim <- attr(x, "alim")
rang <- range(z[[argu]])
alim <- c(max(alim[1], rang[1]),
min(alim[2], rang[2]))
return(fv(z, argu=attr(x, "argu"),
ylab=attr(x, "ylab"),
valu=attr(x, "valu"),
fmla=attr(x, "fmla"),
alim=alim,
labl=attr(x, "labl"),
desc=attr(x, "desc")))
}