How to stop train() of RTrees?

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why do you want / need to do this ?

Thanks for the question. My application can be used to train the model. So user can start the training and if it's taking too long I want to allow the user to stop the training by some user event.

Which according to me can be done if we have some function like stop() or if I can get a handle on the thread on which training happens so that I can stop it.

Till now I have not been able to find anything like that in the library.

i'm afraid, all you have is the TermCriteria (and ctrl^c)

with an ANN, you could train / update it in small batches, and stop if a button was pressed. unfortunately not so with RTrees ;(