[R] rpart space in column names

[Raji]

Hi,

Our data has column names with spaces in that.The names in dataFrame are,
    *[1] "Sepal Length" "Sepal Width"  "Petal Length" "Petal Width" 
"Species" *
When i try to use the column names in rpart function, it gives the following
error.
*   rp<-rpart(as.factor(`Species`)~`Sepal Length`)
Error in `[.data.frame`(frame, predictors) : undefined columns selected*

But , a similar call works for kmeans/nnet functions.For example,
  *nn<-nnet(as.factor(`Species`)~`Sepal Length`,size=3)*

Is there any way in which column names with spaces be used in rpart function
like being used in nnet/kmeans function?

Thanks in advance for your help,
Raji

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