[R] how to generate argument from a vector automatically

From: zhihua li <lzhtom_at_hotmail.com>
Date: Tue 12 Jul 2005 - 19:53:14 EST


hi netters

i have a vector NAMES containing a series of variable names: NAMES=c(x,r,z,m,st,qr,.....nn).
i wanna fit a regression tree by using the code:

           my.tree<-tree(y~x+r+z+m+....nn,my.dataframe)

but i don't want to type out "x+r+z+m+....+nn" one by one, as there are so many variables. besides, sometimes i wanna put the code in a function. so i need to have the argument "x+r+z+m+....+nn" generated from NAMES automatically.

i've tried the code: paste(X,collpase="+") but it didn't work.

could anybody give me a hint?



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