>From what I have understood, you probably need to convert your vector to breeze and do your operations there. Check stackoverflow.com/questions/28232829/addition-of-two-rddmllib-linalg-vectors On Aug 25, 2015 7:06 PM, "Kristina Rogale Plazonic" <kpl...@gmail.com> wrote:
> Hi all, > > I'm still not clear what is the best (or, ANY) way to add/subtract > two org.apache.spark.mllib.Vector objects in Scala. > > Ok, I understand there was a conscious Spark decision not to support > linear algebra operations in Scala and leave it to the user to choose a > linear algebra library. > > But, for any newcomer from R or Python, where you don't think twice about > adding two vectors, it is such a productivity shot in the foot to have to > write your own + operation. I mean, there is support in Spark for p-norm of > Vectors, for sqdist between two Vectors, but not for +/-? As I said, I'm a > newcomer to linear algebra in Scala and am not familiar with Breeze or > apache.commons - I am willing to learn, but would really benefit from > guidance from more experienced users. I am also not used to optimizing > low-level code and am sure that any hack I do will be just horrible. > > So, please, could somebody point me to a blog post, documentation, or just > patches for this really basic functionality. What do you do to get around > it? Am I the only one to have a problem? (And, would it really be so > onerous to add +/- to Spark? After all, even org.apache.spark.sql.Column > class does have +,-,*,/ ) > > My stupid little use case is to generate some toy data for Kmeans, and I > need to translate a Gaussian blob to another center (for streaming and > nonstreaming KMeans both). > > Many thanks! (I am REALLY embarassed to ask such a simple question...) > > Kristina >
