#' Parallel Pearson Product Moment Correlation
#'
#' Computes Pearson Product Moment Correlation
#'
#' @param x a numeric vector
#' @param y a numeric vector
#' @param nthreads An optional argument for specifying the number of threads
#' (in the case of OpenMP or TBB backends) that the routine should (at most)
#' use. Does nothing with a CUDA backend. See \link{nthreads}.
#' @return The Pearson Moment Correlation
#' @examples
#'
#' \dontrun{
#' x <- c(44.4, 45.9, 41.9, 53.3, 44.7, 44.1, 50.7, 45.2, 60.1)
#' y <- c( 2.6, 3.1, 2.5, 5.0, 3.6, 4.0, 5.2, 2.8, 3.8)
#' rthpearson(x, y)
#' }
#
#' @export
rthpearson <- function(x,y, nthreads=rth.nthreads()) {
if (!is.double(x))
storage.mode(x) <- "double"
if (!is.double(y))
storage.mode(y) <- "double"
.Call(c_rthpearson, x, y, as.integer(nthreads))
}
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