> fit.dimer <- rpart(as.factor(out) ~ ., method="class", data=p_df)
>
> fit.dimer$frame[, "var"]
 [1] NE     WC     <leaf> TA     <leaf> <leaf> WG     WD     WW     WC
[11] <leaf> <leaf> <leaf> CT     <leaf> FC     <leaf> YG     QT     <leaf>
[21] <leaf> <leaf> NW     DP     DY     <leaf> SK     <leaf> <leaf> <leaf>
[31] <leaf>
401 Levels: <leaf> AA AC AD AE AF AG AH AI AK AL AM AN AP AQ AR AS AT AV ...
YY
>
> at<-grep("<leaf>", fit.dimer$frame[, "var"], value=FALSE,
ignore.case=TRUE)
>
> fit.dimer$frame[-at, "var"]
 [1] NE WC TA WG WD WW WC CT FC YG QT NW DP DY SK
401 Levels: <leaf> AA AC AD AE AF AG AH AI AK AL AM AN AP AQ AR AS AT AV ...
YY
>
> unique(fit.dimer$frame[-at, "var"])
 [1] NE WC TA WG WD WW CT FC YG QT NW DP DY SK
401 Levels: <leaf> AA AC AD AE AF AG AH AI AK AL AM AN AP AQ AR AS AT AV ...
YY


HI, Dear R community,

I tried to exact the variables used in tree construction, I used above
codes. Is there a way to remove the "401 levels......"?

How to add " "  around each variables? I want them to become "NW", "WC",
etc.

Thanks so much!


-- 
Sincerely,
Changbin
--

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