Dear list,
I am using the ksvm function from kernlab as follows:

(1) learning
> svm.pol4 <- ksvm(class.labs ~ ., data = train.data, prob.model = T, scale
= T, kernel = "polydot")

(2) prediction
> svm.pol.prd4 <- predict(svm.pol4, train.data, type = "probabilities")[,2]

But unfortunately, when calling the prediction, once in every 10s of times
(using the exact same data), it returns the following error message:

Error in prob.model(object)[[p]]$A :
  $ operator is invalid for atomic vectors
Calls: predict -> predict -> .local -> .SigmoidPredict
Execution halted

Does anyone know what the problem is? Any help will be much appreciated.
Cheers

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