On Apr 3, 2012, at 4:16 AM, Raji wrote:
Hi R-helpers,
I am using rpart package for decision tree using R.We are invoking R
environment through JRI from our java application.Hence, the result
of R
command is returned in REXP and we use geterrMessage() to retrieve the
error.
When we execute the following command,
cnr_model<-rpart(as.factor(Species)~Sepal Length+Sepal Width+Petal
Length,
You have spaces in your variable names. That has nothing to do with
JRI and everything to do with base R syntax.
(You also have no data argument so are you attaching it. That would
seem to be an unwise choice.)
method="class", parms=list(split="gini",prior=c()),
control=rpart.control(minsplit=2,
na
.action
=
na
.pass
,cp
=
0.001
,usesurrogate=1,maxsurrogate=2,surrogatestyle=0,maxdepth=20,xval=10))
we get an error message* "Error: unexpected symbol in
"a<-cnr_model<-rpart(as.factor(Species)~Sepal Length""*
The unexpected symbol was "Length". Spaces are separators to the R
parser.
The REXP returned in not null and the geterrMessage() call doesnt
return an
error message.
But for other errors in R , say "summary(cnr_model)" , REXP returned
is null
and we get the following error message from geterrMessage() call.
*Error in summary(cnr_model) : object 'cnr_model' not found*
Right. It wasn't found because the command you tried to create it
with ... failed.
Is this behavior of showing error message specific to rpart package ?
No. It would be very generic.
Why is
this difference in the way error message is displayed in rpart
package?Can
you please let us know how to retrieve error messages of rpart command
through JRI?
Thanks in advance.
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