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withnin
2015 Feb 09
1
WISH: eval() to preserve the "visibility" (now value is always visible)
Sorry to intervene.
Argument passed to 'eval' is evaluated first.
So,
eval(x <- 2)
is effectively like
{ x <- 2; eval(2) } ,
which is effectively
{ x <- 2; 2 } .
The result is visible.
eval(expression(x <- 2))
or
eval(quote(x <- 2))
or
evalq(x <- 2)
gives the same effect as
x <- 2 .
The result is invisible.
In function 'eval2',
res <-