add documentation notes

R-package/R/xgb.load.R

@@ -1,3 +1,16 @@
+#' Load xgboost model from binary file
+#' 
+#' Load xgboost model from the binary model file
+#' 
+#' @param modelfile the name of the binary file.
+#' 
+#' @examples
+#' data(iris)
+#' bst <- xgboost(as.matrix(iris[,1:4]),as.numeric(iris[,5]), nrounds = 2)
+#' xgb.save(bst, 'iris.xgb.model')
+#' bst <- xgb.load('iris.xgb.model')
+#' pred <- predict(bst, as.matrix(iris[,1:4]))
+#' 
 xgb.load <- function(modelfile) {
   if (is.null(modelfile)) 
     stop("xgb.load: modelfile cannot be NULL")