apply	Apply Functions Over Array Margins	apply(X, MARGIN, FUN, ...)
	对阵列行或者列使用函数
lapply	Apply a Function over a List or Vector	lapply(X, FUN, ...)
	对列表或者向量使用函数
sapply	Apply a Function over a List or Vector	sapply(X, FUN, ..., simplify = TRUE, USE.NAMES = TRUE)
	对列表或者向量使用函数
vapply	Apply a Function over a List or Vector	vapply(X, FUN, FUN.VALUE, ..., USE.NAMES = TRUE)
	对列表或者向量使用函数
tapply	Apply a Function Over a Ragged Array	tapply(X, INDEX, FUN = NULL, ..., simplify = TRUE)
	对不规则阵列使用函数
eapply	Apply a Function Over Values in an Environment	eapply(env, FUN, ..., all.names = FALSE, USE.NAMES = TRUE)
	对环境中的值使用函数
mapply	Apply a Function to Multiple List or Vector Arguments	mapply(FUN, ..., MoreArgs = NULL, SIMPLIFY = TRUE, USE.NAMES = TRUE)
	对多个列表或者向量参数使用函数
rapply	Recursively Apply a Function to a List	rapply(object, f, classes = "ANY", deflt = NULL,how =  c("unlist", "replace", "list"), ...)
	运用函数递归产生列表