Nothing
as.fd <- function(x, ...){
UseMethod('as.fd')
}
as.fd.fdSmooth <- function(x, ...){
x$fd
}
as.fd.dierckx <- function(x, ...){
# Translate an object of class dierckx to class fd
##
## 1. check class
##
objName <- deparse(substitute(x))
{
if(length(objName)>1)
objName <- character(0)
else
if(nchar(objName)>33)
objName <- substring(objName, 1, 33)
}
if(!inherits(x, 'dierckx'))
stop("'x' (", objName, ") is not of class 'dierckx', is ",
class(x))
#
if(x$periodic)
stop("object ", objName, " uses periodic B-splines. ",
"and as.fd is programmed to translate only ",
"B-splines with coincident boundary knots.")
##
## 2. Create a basis
##
rngval <- with(x, c(from, to))
nKnots <- x$n
# length(dierckx$knots) = nest = estimated number of knots
# number actually used = dierckx$n
# knots <- object$knots[1:n]
Knots <- knots(x, interior=FALSE)
k <- x$k
nOrder <- k+1
breaks <- Knots[nOrder:(nKnots-k)]
#
xlab <- x$xlab
# if(!require(fda))
# stop("library(fda) required for function 'dierckx2fd'",
# "; please install.")
#
B.basis <- create.bspline.basis(rangeval=rngval, norder=nOrder,
breaks=breaks, names=xlab)
##
## 3. Create fd object
##
coef. <- coef(x)
#
ylab <- x$ylab
fdNms <- list(args=xlab, reps="reps 1", funs=ylab)
fd(coef=coef., basisobj=B.basis, fdnames=fdNms)
}
as.fd.function <- function(x, ...){
# Translate an object of class splinefun to class fd
##
## 1. check class
##
objName <- deparse(substitute(x))
{
if(length(objName)>1)
objName <- character(0)
else
if(nchar(objName)>33)
objName <- substring(objName, 1, 33)
}
if(!inherits(x, 'function'))
stop("'x' (", objName, ") is not of class function")
#
xenv <- environment(x)
xz <- get('z', xenv)
if(is.null(xz))
stop("NULL environment of 'x' (", objName,
"); therefore, it can NOT have been created by 'splinefun.'")
#
if(is.null(xz$method))
stop("'x' (", objName, ") has a NULL 'method', and therefore",
" can NOT have been created by 'splinefun.'")
# z$method: 1=periodic, 2=natural, 3=fmm (std B-Splines, I believe)
# if(xz$method!=3){
if(!(xz$method %in% 2:3)){
msg <- paste("x (", objName, ") ", sep='')
msg2 <- {
if(xz$method=="1")
paste(msg, " uses periodic B-splines, and as.fd ",
"is programmed\n to translate only B-splines ",
"with coincident boundary knots.", sep='')
else
paste(msg, "does not use B-splines as required ",
"for function 'as.fd'.")
}
stop(msg2)
}
##
## 2. Create a basis
##
Knots <- xz$x
y.x <- xz$y
# basis <- create.bspline.basis(breaks=Knots)
basis <- create.bspline.basis(range(Knots), breaks=Knots)
fd. <- fdPar(basis, lambda=0)
nKn <- length(Knots)
nobs <- (2*nKn-1)
x. <- seq(Knots[1], Knots[nKn], length=nobs)
smooth.basis(x., x(x.), fd.)$fd
}
as.fd.smooth.spline <- function(x, ...){
# Translate an object of class smooth.spline to class fd
##
## 1. check class
##
objName <- deparse(substitute(x))
{
if(length(objName)>1)
objName <- character(0)
else
if(nchar(objName)>33)
objName <- substring(objName, 1, 33)
}
if(!inherits(x, 'smooth.spline'))
stop("'x' (", objName, ") is not of class smooth.spline")
##
## 2. Create a basis
##
Kn0 <- x$fit$knot
x0 <- min(x$x)
x1 <- max(x$x)
Knots <- (x0+(x1-x0)*Kn0[4:(length(Kn0)-3)])
# Don't use 'unique' in case 'x' has coincident interior knots.
# basis <- create.bspline.basis(breaks=Knots)
basis <- create.bspline.basis(range(Knots), breaks=Knots)
#
fd(x$fit$coef, basis)
}
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