That was the problem. Thanks David!
James
On Tue, Feb 12, 2013 at 2:08 PM, David Winsemius <dwinsem...@comcast.net>wrote:
>
> On Feb 12, 2013, at 10:53 AM, James Jong wrote:
>
> > When I try to crate a grid of parameters for training with caret I get
> > various errors:
> > ------------------------------------------------------------
> >> my_grid <- createGrid("rf")
> > Error in if (p <= len) { : argument is of length zero
> >
> >> my_grid <- createGrid("rf", 4)
> > Error in if (p <= len) { : argument is of length zero
> >
> >> my_grid <- createGrid("rf", len=4)
> > Error in if (p <= len) { : argument is of length zero
> >
> > The documentation for createGrid says:
> > ------------------------------------------------------------
> > This function creates a data frame that contains a grid of
> > complexity parameters specific methods.
> > Usage:
> > createGrid(method, len = 3, data = NULL)
> > Arguments:
> > method: a string specifying which classification model to use. See
> > 'train' for a full list.
> > len: an integer specifying the number of points on the grid for
> > each tuning parameter.
> > data: the training data (only needed in the case where the 'method'
> > is 'cforest', 'earth', 'bagEarth', 'fda', 'bagFDA', 'rpart',
> > 'svmRadial', 'pam', 'lars2', 'rf' or 'pls'). The outcome
> > should be in a column called '.outcome'.
>
> Looking at that example, my first guess would be that your call is missing
> a proper 'data' argument. It says one is needed if the method is 'rf'.
>
> --
> david.
>
>
> >
> >
> > and gives the following examples:
> > ------------------------------------------------------------
> > createGrid("rda", 4)
> > createGrid("lm")
> > createGrid("nnet")
> >
> > ## data needed for SVM with RBF:
> > ## Not run:
> >
> > tmp <- iris
> > names(tmp)[5] <- ".outcome"
> > head(tmp)
> > createGrid("svmRadial", data = tmp, len = 4)
> > ## End(Not run)
> >
> >
> > What I am doing wrong?
> >
> > Also, what is the connection between len above and tuneLength in the
> > argument for train?
> >
> > Thanks,
> >
> > James
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> David Winsemius
> Alameda, CA, USA
>
>
[[alternative HTML version deleted]]
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