[R] memory error with rpart()

[Ji Zhu]

Dear all,

I have a 100 iteration loop. Within each loop, there are some calls
to rpart() like:

ctl <- rpart.control(maxcompete=0, maxsurrogate=0, maxdepth=10)
temp <- rpart(y~., x, w=wt, method="class", parms=list(split="gini"),
control=ctl)
res <- log(predict.rpart(temp, type="prob"))
newres <- log(predict.rpart(temp, newdata=newx, type="prob"))

The code runs fine for the first 30-60 iterations, then gives me the
following error message and crashes:

The instruction at "0x112b4143" referenced memory at "0x00000000".
The memory could not be "read".

Could anyone give me some hint about what this error message implies?
Thanks a lot!

I'm using R1.4.1 on Windows2000.

-Ji Zhu

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