R help - May 2011 - how to store object without loosing their class property

Hello all,

I'm trying to store some objects (class = "svm") , but if I use a
list
the objects get somehow converted and I can't retrieve them as objects
of type "svm".
So how to I properly store objects of that kind?

best regards
-----------

library(e1071)

data(iris)
attach(iris)

## classification mode
# default with factor response:
model <- svm(Species ~ ., data = iris)


print(class(model))
models = list()
models = c(model,model)

print(class(models[[1]]))
-----------

use "list" instead of "c":

models <- list(model,model)
sapply(models, class)

#      [,1]          [,2]
# [1,] "svm.formula" "svm.formula"
# [2,] "svm"         "svm"

For understanding what c does in your case:

c(list(first=1, second=2), list(third=3, fourth=4))
# compare this with list(list(first=1, second=2), list(third=3, fourth=4))

Kenn

On Tue, May 31, 2011 at 4:43 PM, Immanuel B <mane.desk at googlemail.com>
wrote:
> Hello all,
>
> I'm trying to store some objects (class = "svm") , but if I
use a list
> the objects get somehow converted and I can't retrieve them as objects
> of type "svm".
> So how to I properly store objects of that kind?
>
> best regards
> -----------
>
> library(e1071)
>
> data(iris)
> attach(iris)
>
> ## classification mode
> # default with factor response:
> model <- svm(Species ~ ., data = iris)
>
>
> print(class(model))
> models = list()
> models = c(model,model)
>
> print(class(models[[1]]))
> -----------
>
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