Hi,
is it true that the only way to tell rpart which variables to use is to specify every single variable in the formula and separate them with "+"?
I wonder if this error...
rotree <- rpart(powerdata[,1]~powerdata[,2:3],+ method="class")
Error in model.frame(formula, rownames, variables, varnames, extras,
extranames, : invalid variable type
...can be prevented by other means than...
rotree <- rpart(segments~V1.3+V1.9,
+ method="class",data=powerdata)
This works. (The variables here are powerdata[,1] and [,2:3].)
But I do not want to write 200 variable names down, as this is the real size of "powerdata".
Is there any way around that?
Christian
Consider to use
rotree <- rpart(segments ~ ., method = "class", data = powerdata)
The "." defines all variables in powerdata, except for "segments", as usual for formulas.
Uwe Ligges
*********************************************************************** Christian Hennig Fachbereich Mathematik-SPST/ZMS, Universitaet Hamburg [EMAIL PROTECTED], http://www.math.uni-hamburg.de/home/hennig/ ####################################################################### ich empfehle www.boag-online.de
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