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
***********************************************************************
Christian Hennig
Fachbereich Mathematik-SPST/ZMS, Universitaet Hamburg
[EMAIL PROTECTED], http://www.math.uni-hamburg.de/home/hennig/
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ich empfehle www.boag-online.de
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