delayedAssign
Also note that earlier in the same example we have:
msg <- "old"
delayedAssign("x", msg)
msg <- "new!"
x #- new!
[1] "new!"
substitute(x) #- msg
x
R.version.string # Vista
[1] "R version 2.6.0 alpha (2007-09-06 r42791)" That is substitute(x) gives x, not msg.
On 9/19/07, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
The last two lines of example(delayedAssign) give this:
e <- (function(x, y = 1, z) environment())(1+2, "y", {cat(" HO! "); pi+2})
(le <- as.list(e)) # evaluates the promises
$x <promise: 0x032b31f8> $y <promise: 0x032b3230> $z <promise: 0x032b3268> which contrary to the comment appears unevaluated. Is the comment wrong or is it supposed to return an evaluated result but doesn't?
R.version.string # Vista
[1] "R version 2.6.0 alpha (2007-09-06 r42791)"