In rpart < 3.1, the rpart object has a component called parms, which was
stored as a vector. In rpart 3.1, the parms component is stored as a list,
but xpred.rpart (3.1) is still expecting a vector.
From 3.0.2:
iris.rpart$parms
[1] 0.3333333 0.3333333 0.3333333 0.0000000 1.0000000 1.0000000 1.0000000
[8] 0.0000000 1.0000000 1.0000000 1.0000000 0.0000000 1.0000000
In 3.1.0
> iris.rpart.310$parms
$prior
[1] 0.3333333 0.3333333 0.3333333
$loss
[,1] [,2] [,3]
[1,] 0 1 1
[2,] 1 0 1
[3,] 1 1 0
$split
[1] 1
This structure is fairly obvious from reading the rpart help, but does not
work with xpred.rpart as long as there is a non-default parms argument in
the rpart object.
Dr. Marc R. Feldesman
email: feldesmanm at pdx.edu
email: feldesman at attglobal.net
fax: 503-725-3905
"Don't know where I'm going.
Don't like where I've been.
There may be no exit.
But hell, I'm going in." Jimmy Buffett
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