[R] Variable alias

[Daniel Haase]

Hi Everyone,

is there the possibility in R to assign a variable to be an alias of  
another one?

Example:

x <- 17
# assign y to be an alias of x
y # returns 17
x <- 4
y # returns 4

Daniel

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[R] Last expression entered by user

[Daniel Haase]

Hi,

I am looking for a way to find out the last expression that was  
entered by the user, similar to ".Last.value", but for the unevaluated  
expression instead of the evaluated one.


Example:

x <- 4
x*x + 3

[1] 19

.Last.value # that's the evaluated last expression

[1] 19
# but I am looking for the unevaluated expression (".Last.expression",  
so to say), which would be expression(x * x + 3) in this case


Daniel

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and provide commented, minimal, self-contained, reproducible code.