[R] Error in mvpart example

Gavin Simpson
Sat, 27 Feb 2010 10:43:56 -0000

These functions (rpart, the mvpart wrapper, and summary.rpart) are
fairly complex doing many things.

For contributed packages you'd be best served by contacting the
author/maintainer. I've CC'd Glenn (the maintainer) here.

HTH

G

On Fri, 2010-02-26 at 13:55 +0000, Wearn, Oliver wrote:
> Dear all,
>
> I'm getting an error in one of the stock examples in the
'mvpart'
> package. I tried:
>
> require(mvpart)
> data(spider)
> fit3 <-
rpart(gdist(spider[,1:12],meth="bray",full=TRUE,sq=TRUE)~water
> +twigs+reft+herbs+moss+sand,spider,method="dist") #directly
> from ?rpart
> summary(fit3)
>
> ...which returned the following:
>
> Error in apply(formatg(yval, digits - 3), 1, paste, collapse =
",",
> sep = "") :
>   dim(X) must have a positive length
>
> This seems to be a problem with the cross-validation, since the
> "xerror" and "xstd" columns are missing from the
summary table as
> well.
>
> Using the mpart() wrapper results in the same error:
>
>
fit4<-mvpart(gdist(spider[,1:12],meth="bray",full=TRUE,sq=TRUE)~water
> +twigs+reft+herbs+moss+sand,spider,method="dist")
> summary(fit4)
>
> Note, changing the 'method' argument to ="mrt" seems,
superficially,
> to solve the problem. However, when the dependent variable is a
> dissimilarity matrix, shouldn't method="dist" be used (as per
the
> examples)?
>
> Thanks, in advance, for any help on this error.
>
> Oliver
> ______________________________________________
> R-help at 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.

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