r - 进入一个环境

Question

我想问是否有一个功能可以将我们发送到一个环境中。例如：

# create two environments
Env1 <- new.env()
Env2 <- new.env()

# assign one variable into each environment
assign("v1", "1", envir = Env1)
assign("v2", "2", envir = Env2)

# In order to refer to the variable in Env2 I have to use Env2$v2, for example 
print(Env2$v2)

# The question is if there is some function that sents us into Env2
# so that when we refer to the variable in Env2 to use just v2, that is
print(v2)

谢谢你们

Answer 1

根据“引用变量”的含义，attach执行以下操作：

attach(Env2)
print(v2)
## [1] "2"

detach()
print(v2)
## Error in print(v2) : object 'v2' not found

尝试修改该值是另一回事，因为它附加在位置 2。