As Bart pointed out in his comment, we recently had a problem with users affiliated with AccelerEyes excessively promoting their ArrayFire library in dozens of answers. Someone flagged your answers as continuing in this trend, and given that every answer you left was complimentary of this library, they were assumed to be part of this and removed.
I looked into this, and I can see that you don't appear to be associated with those who were promoting ArrayFire before, so I've undeleted your answers. Even the case of the AccelerEyes folks doing this was a tricky one, because it does seem to be a good library for some of these cases, but they were a little overzealous in promoting it.
One thing I might caution is to avoid going around and only providing recommendations for this library in questions that don't ask about alternatives like this. It really starts to look like astroturfing if every answer by a new user recommends a commercial library, particularly if the question was about how to do something in another library.