On Feb 22, 2010, at 8:05 AM, Jay wrote:
The function prediction() returns this:
Formal class 'performance' [package "ROCR"] with 6 slots
..@ x.name : chr "Cutoff"
..@ y.name : chr "Accuracy"
..@ alpha.name : chr "none"
..@ x.values :List of 1
.. ..$ : Named num [1:89933] Inf 2.23 2.22 2.17 2.16 ...
.. .. ..- attr(*, "names")= chr [1:89933] "" "36477" "56800"
"41667" ...
..@ y.values :List of 1
.. ..$ : num [1:89933] 0.5 0.5 0.5 0.5 0.5 ...
..@ alpha.values: list()
Now, since I want to match each prediction with its original case, I
need to extract the names, i.e. the information in "- attr(*,
"names")= chr [1:89933] "" "36477" "56800" "41667" ..." so I can use
it with a simple datafile[names,] query.
How do I get these names in plain number formats?
Not sure what you mean by "plain number formats" but this should get
you a vector of "names" assuming the prediction object is named
"predobject":
names( predobj...@x.values )
If you wanted them "as.numeric", then that is the name of the
appropriate function.
--
David
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