[R] How make a x,y dataset from a formula based entry

Jean-Christophe BOUËTTÉ jcbouette at gmail.com
Thu Sep 22 22:14:05 CEST 2011

You can check ?model.frame.
I do not know however to extract only the right-hand of left-hand part
of a formula.


2011/9/22 trekvana <trekvana at aol.com>:
> Hello all,
> So I am using the (formula entry) method for randomForests:
> randomForest(y~x1+x2+...+x39+x40,data=xxx,...) but the issue is that some of
> the items in that package dont take a formula entry - you have to explicitly
> state the y and x vector:
> randomForest(x=xxx[,c('x1','x2',...,'x40')],y=xxx[,'y'],...)
> Now my question is whether there is a function/way to tell R to take a
> formula and make the two corresponding datasets [x,y] (that way I dont have
> to create the x dataset manually with all 40 variables I have).
> There must be a more elegant way to do this than
> x=xxx[,c('x1','x2',...,'x40')]
> Thanks!
> George
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