Co-Operation: Fast Covariance, Correlation, and Cosine
Similarity Operations
Fast implementations of the co-operations: covariance,
    correlation, and cosine similarity.  The implementations are
    fast and memory-efficient and their use is resolved
    automatically based on the input data, handled by R's S3
    methods.  Full descriptions of the algorithms and benchmarks
    are available in the package vignettes.
c(person("Drew", "Schmidt", role=c("aut", "cre"),
    email="wrathematics@gmail.com"), 
    person("Christian", "Heckendorf", role="ctb", comment="Caught some
    memory errors."))
Drew Schmidt [aut, cre],
  Christian Heckendorf [ctb] (Caught some memory errors.)