[R] Error in mvpart example

[Gavin Simpson]

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
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.

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