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...that CART procedure can be available to categorical and continuous variables. How can I correct the R code such that x2 is regard as categorical and not ordinal? By all means, reply me your suggestion or comments. Thanks and best regards, Baba ----------beginning of R code -------------------- inputlist <- list(Y=0, x1=0, x2=0, x3=0,x4=0,x5=0) # inputlist <- list(Y=0, x1=0, x2="", x3=0,x4=0,x5=0) Ex6 <- scan("c:\\data\\CART\\EX6.txt",inputlist) Ex6.ltr <- tree(Y ~ x1 + x2 +x3 + x4 +x5 ,Ex6) ----------end of R code --------------------------- -.-.-.-.-.-.-.-.-.-.-....

As a newer R practicioner, it seems I stump myself weekly (at least) with issues that have spinning my wheels.  Here is yet another... I'm trying to turn a list of numeric vectors (of uneual length) inot a dataframe.  Each vector held in the list represents a row, and there are some rows of unequal length.  I would like NAs as placeholders for "missing" data in the shorter vectors.