[R] extractAIC using surf.ls
h.y.wong at leeds.ac.uk
Fri Aug 11 10:55:35 CEST 2006
On 11 Aug 2006, at 08:17, Prof Brian Ripley wrote:
> Roger, thank you for looking into this.
Yes, and thanks to both of you for the corrections.
> However, the posting guide asked the poster to contact the
> maintainer. Had
> (s)he done so, I would have pointed out that spatial 7.28-2 (the
> version for R-devel) has this corrected (in a slightly simpler way).
Thanks. There have been a few times when what I thought was a bug was
due to a misunderstanding on my part. It seems better to me to check
on the R-help list that it really is a bug before bothering the
On that note, I see that Prof. Ripley is the author of the loess
package. When trying to adjust some of the control parameters for a
loess fit, I tried the following (wrong) incantation.
loess(dist ~ speed, cars, control = list(statistics = "exact"))
Although it is wrong (should be control = loess.control(statistics =
"exact")), entering this as a command actually crashes R on the 2
systems I have tried (OS X, linux, both R-2.3.1), with the error
below. I'm not sure if you consider this a bug, as the command I
typed was invalid.
*** caught segfault ***
address (nil), cause 'memory not mapped'
1: .C(R_loess_raw, as.double(y), as.double(x), as.double
(weights), as.double(robust), as.integer(D), as.integer(N),
as.double(span), as.integer(degree), as.integer(nonparametric),
as.integer(order.drop.sqr), as.integer(sum.drop.sqr), as.double
(span * cell), as.character(surf.stat), fitted.values = double
(N), parameter = integer(7), a = integer(max.kd), xi = double
(max.kd), vert = double(2 * D), vval = double((D + 1) *
max.kd), diagonal = double(N), trL = double(1), delta1 = double
(1), delta2 = double(1), as.integer(surf.stat == "interpolate/
2: simpleLoess(y, x, w, span, degree, parametric, drop.square,
normalize, control$statistics, control$surface, control$cell,
3: loess(dist ~ speed, cars, control = list(statistics = "exact"))
1: abort (with core dump)
2: normal R exit
3: exit R without saving workspace
4: exit R saving workspace
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