-library(MASS) #simulate from a multivariate normal distribution
-
-generateIO = function(meanX, covX, covY, pi, beta, n){ #don't need meanX
+#' Generate a sample of (X,Y) of size n
+#' @param covX covariance for covariates
+#' @param covY covariance for the response vector
+#' @param pi proportion for each cluster
+#' @param beta regression matrix
+#' @param n sample size
+#' @return list with X and Y
+#' @export
+#-----------------------------------------------------------------------
+generateIO = function(covX, covY, pi, beta, n)
+{