Hi,
forget about the below details. It is not related to the fact that
the function is returned from a function. Sorry about that. I've
been troubleshooting soo much I've been shoting over the target. Here
is a much smaller reproducible example:
x <- 1:10
y <- 1:10 + rnorm(length(x))
sp <- smooth.spline(x=x, y=y)
ypred <- predict(sp$fit, x)
# [1] 2.325181 2.756166 ...
ypred2 <- predict(sp$fit, c(0,x))
# Error in Recall(object, xrange) : couldn't find
# function "predict.smooth.spline.fit"
/Henrik
On 4/5/06, Henrik Bengtsson <[EMAIL PROTECTED]> wrote:
> Hi,
>
> yesterday I got very useful feedback on what is the best way to return
> a function from a function.
>
> Now, I run into a problem calling a returned function that down the
> stream uses Recall(). Below is a self-contained example. I took away
> yesterday's code for returning a minimal environment for the function,
> because that is not related to this problem.
>
> getPredictor <- function(x, y) {
> sp <- smooth.spline(x=x, y=y, keep.data=FALSE)
> function(x, ...) predict(sp$fit, x, ...)$y
> }
>
> # Simulate data
> x <- 1:10
> y <- 1:10 + rnorm(length(x))
>
> # Estimate predictor function
> fcn <- getPredictor(x,y)
>
> # No extrapolation => no Recall()
> ypred <- fcn(x)
> print(ypred)
> # Gives: # [1] 2.325181 2.756166 ...
>
> # With extrapolation => Recall()
> xextrap <- c(0,x)
> ypred <- fcn(xextrap)
> # Gives: # Error in Recall(object, xrange) : couldn't find
> # function "predict.smooth.spline.fit"
>
> To see what's the function looks like, do
>
> pfcn <- getAnywhere("predict.smooth.spline.fit")$obj[[2]]
> page(pfcn)
>
> A workaround is to set the predict.smooth.spline.fit() in .GlobalEnv, i.e.
>
> predict.smooth.spline.fit <- pfcn
>
> Does Recall() have a problem because predict.smooth.spline.fit() is
> not exported, or what is going on? Are there alternatives to the
> above workaround? I can see how such a workaround can become very
> complicated with complex functions where it is hard to predict what
> functions are called when.
>
> /Henrik
>
> PS, may I suggest to modify page() so that
> 'page(getAnywhere("predict.smooth.spline.fit"))' works? DS.
>
--
Henrik Bengtsson
Mobile: +46 708 909208 (+2h UTC)
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