若要执行此操作的最简单方法是使用 rowSelection 参数。以下是短的例子，使用它与 RevoScaleR 示例数据集 CensusWorkers.xdf:
inFile <- file.path(rxGetOption("sampleDataDir"), "CensusWorkers") rxCube(incwage ~ sex : state, data = inFile, rowSelection = age >=30 & age <=50 & wkswork1 > 40, means=TRUE)
