[R] How to keep the same class?

[Henrique Dallazuanna]

Try this:

predict(fit10,testX[1,,drop = FALSE])

On Fri, Sep 2, 2011 at 5:05 PM, Eduardo M. A. M.Mendes
<emammendes at gmail.com> wrote:
> Hello
>
>
>
> Please see the example below
>
>
>
>> class(testX)
>
> [1] "matrix"
>
>> class(testX[1,])
>
> [1] "numeric"
>
>
>
> Why not matrix?   What am I missing here?   Is there a way to keep the same
> class?
>
>
>
> The reason for the question is that I want to implement a k-step ahead
> prediction for my own routines and R wrecks does not seem to like [1,] as
> shown below.
>
>
>
>> predict(fit10,testX[1,])
> Error in knnregTrain(train = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  :
>  dims of 'test' and 'train differ
>> predict(fit10,testX[1:2,])
> [1] 81.00 76.36
>
>
>
> Many thanks
>
>
>
> Ed
>
>
>
>
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>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O