[BioC] enquiry about errorest with model-knn

[Holger Schwender]

Hi Xin,

first of all you must replace knn by ipredknn. Then you have to write your
own predict function (see the help of errorest in the ipred package).

Something like 

> mypredict.knn <- function(object, newdata)
 +     predict(object, newdata = newdata,type="class")

should work. Then your knn analysis can be done by

> errorest(Species ~ ., data = iris, model = ipredknn, estimator = "cv",  
+ predict=mypredict.knn)

By the way, this is actually a question for the R help and not for the BioC
help.

Best,
Holger

> Dear all,
> 
> Can somebody give me a clue why I always get the following error?
> 
> errorest(Species ~ ., data = iris, model = knn, estimator = "cv")$err
> 
> Error in model(formula, data = folddata, ...) : 
>         unused argument(s) (data ...)
> 
> Xin LIU
> 
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