Hi,
I have been working generating decision tree analyses on large numbers of
simulation datasets using the RPART function.? With some datasets, RPART is
returning an error of "Error in yval[, 1] : incorrect number of
dimensions".?
There seem to be certain types of splits that cause it to break and return this
message.?
I?am able to isolate the record at which this error message will begin
appearing.? For
example, there is a difference of one record in the enclosed files; one file
(noproblem.csv) will
correctly produce output.? The second (problem.csv), with only one additional
record, will
return the error message and no output.?
I am running R 2.13.0 on a Windows XP platform.?
To reproduce the problem:
library(rpart)
data <- read.csv("problem.csv",
header=T)control=rpart.control(minbucket=10)
x <- rpart(cad~v1+v2+v3+v4+v5+v6+v7+v8+v9+v10,data=data, method =
"class",
control=control)
summary(x)
Similar code run on "noproblem.csv" will not produce the error.
Any suggestions on how to proceed to debug this issue would be greatly
appreciated.? I am a novice R user, but not a novice programmer (SAS, some C,
Java).?
Thanks for your time.
Victor Pontes
Inatec, Inc.
Medford, MA
