Hello all,

When attempting a classification tree using mvpart, I get the following
error:

> thesis2.mvp=mvpart(bat_sp~., data=alltrees.df)
Error in all(keep) :
  unused argument(s) (c(TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE))

bat_sp is an unordered categorical variable, and the predictors are a
mixture of categorical and continuous variables. I had run the algorithm
successfully in the past (about 1.5 years ago) on a preliminary subset of
the same dataset using a previous version of R  The current system is R
2.8.1 running under Ubuntu Jaunty. Any ideas as to the cause?

Josh Stumpf

Eastern Michigan University

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