Comments (1)
I made some tests using iris and an additional attribute with a single value. The first test added a numeric attribute and the second test added a factor attribute:
library(mfe)
data(iris)
iris$x = 1
metafeatures(Species~. , iris)
data(iris)
iris$x = factor(1)
metafeatures(Species~. , iris)
The first test returns an (expected) warning in the cov function. The second test returns an error caused by the single level attribute in the model.matrix (in the binarize function).
I checked how the other packages deal with that. While the rpart and nnet remove the attribute, the e1071 and kknn return the same error.
data(iris)
iris$x = factor(1)
library(e1071)
svm(Species~., iris)
library(kknn)
kknn(Species~., iris)
library(rpart)
rpart(Species~., iris)
I wish close the issue
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