1)使一个环境成为另一个环境的父项，并使用 with(child，...):

1) Make one environment the parent of the other and use with(child, ...) :

parent <- new.env(); parent$x <- 1
child <- new.env(parent = parent); child$y <- 2

with(child, x + y) # x comes from child and y from parent
## [1] 3

您可以根据需要在尽可能长的链中链接任意数量的环境.

You can link as many environments as you like in as long a chain as necessary.

请注意，如果最初创建的孩子没有父母，那么以后可以使用以下方法添加父母:

Note that if the child were initially created with no parent then you can add a parent later using:

parent.env(child) <- parent

因此我们将 LoadData1 和 LoadData2 定义为:

# define LoadData1 to have a parent argument
LoadData1 <- function(parent = emptyenv()) {
        # calculation of environment e goes here
        parent.env(e) <- parent
        e
}

# define LoadData2 to have a parent argument
LoadData2 <- function(parent = emptyenv()) {
        # calculation of environment e goes here
        parent.env(e) <- parent
        e
}

# run
e1 <- LoadData1()
e2 <- LoadData2(parent = e1)
with(e2, dataFrom1 + dataFrom2)

如果您不想从现在的状态修改 LoadData1 和 LoadData2 :

If you don't want to modify LoadData1 and LoadData2 from what they are now:

e1 <- LoadData1()
e2 <- LoadData2()
parent.env(e2) <- e1
with(e2, dataFrom1 + dataFrom2)

2)转换为列表:

with(c(as.list(e1), as.list(e2)), somefunction())

添加第二种方法.