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'.
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
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