Hello list, is there any R function for generating spline for implicit functions, for example a spline for an two-column data frame where for one value for one variable there maybe several correspondent values for another? Many thanks.
Currently I'm using this home-made one:
> spline2d <- function(df, ...)
> {
> xname <- colnames(df)[1]
> yname <- colnames(df)[2]
>
> df <- data.frame(c(1 : nrow(df)), df[1], df[2])
> colnames(df) <- c("index", xname, yname)
>
> df <- data.frame(
> spline(df[c("index", xname)], ...)$y,
> spline(df[c("index", yname)], ...)$y
> )
> colnames(df) <- c(xname, yname)
> return(df)
> }
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