On Nov 12, 2008, at 11:28 , Itziar Frades Alzueta wrote:
Hi,
Does anyone know what the negative indexing of a matrix mean?
?`[`
For '['-indexing only: 'i, j, ...' can be logical vectors,
indicating elements/slices to select. Such vectors are
recycled if necessary to match the corresponding extent. 'i,
j, ...' can also be negative integers, indicating
elements/slices to leave out of the selection.
.. so in your case you're removing one of the predictors (and I don't
think you really have a matrix there ...).
Cheers,
S
I am using the RWeka and this evaluate classifier does not work on new
data like this
e <- evaluate_Weka_classifier(m1235,newdata=XW4, complexity =
FALSE,class = FALSE)
while it work with negative indexing:
e <- evaluate_Weka_classifier(m1235,newdata=XW4[,-2], complexity =
FALSE,class = FALSE)
Although I do not understand what negative indexing of a matrix means,
or whether it produces any transformation.
Regards,
Itziar Frades
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