Nothing
aspline <- function(x, y=NULL, xout, n = 50, ties=mean, method="improved", degree=3) {
if (! method %in% c("original", "improved")) stop(paste("unknown method:", method))
x <- xy.coords(x, y) # -> (x,y) numeric of same length
y <- x$y
x <- x$x
nx <- length(x)
if(any(na <- is.na(x) | is.na(y))) {
ok <- !na
x <- x[ok]
y <- y[ok]
nx <- length(x)
}
if (!identical(ties, "ordered")) {
if (length(ux <- unique(x)) < nx) {
if (missing(ties))
warning("Collapsing to unique x values")
y <- as.vector(tapply(y,x,ties))# as.v: drop dim & dimn.
x <- sort(ux)
nx <- length(x)
} else {
o <- order(x)
x <- x[o]
y <- y[o]
}
}
if (nx < 1)
stop("need at least one non-NA value to interpolate (single value yields constant result)!")
if (missing(xout)) {
if (n <= 0)
stop("aspline requires n >= 1")
xout <- seq(x[1], x[nx], length = n)
}
aSpline(x,y,xout,method,degree)
}
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