Abstract
We introduce rrecsys, an open source extension package in R for rapid prototyping and intuitive assessment of recommender system algorithms. As the only currently available R package for recommender algorithms (recommenderlab) did not include popular algorithm implementations such as matrix factorization or One-class Collaborative Filtering algorithms we developed rrecsys as an easily accessible tool that can, for instance, be employed for interactive demonstrations when teaching. This package replicates state-of-the-art Collaborative Filtering algorithms for rating and binary data and we compare results with the Java-based LensKit implementation and recommederlab for the purpose of benchmarking the implementation. Therefore this work can also be seen as a contribution in the context of replication of algorithm implementations and reproduction of evaluation results.