Predicting Probabilities for GBM with caret library

Question

A similar question was asked however the link in the answer points to random forest example, it doesn\'t seem to work in my case.

Here is an example what I\'m trying

Answer 1

It's the key:

I get a binary vector of predictions, which is good:

[1] 0 1 0 0 1 0 0 0 0 0 0 0 1 1 0 0 1 1 1 0 0 0 1 ...

Your factor labels could be interpret as numeric. I don't know why, but if you change 0 on 'a' and 1 on 'b' for instance, it will work without errors.