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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