Got it. Thanks very much.
On 5/28/07, Prof Brian Ripley [EMAIL PROTECTED] wrote:
How about 'traceback'? (It does not necesssarily show all the frames, but
it does help and the exceptions are fairly esoteric.)
On Mon, 28 May 2007, ronggui wrote:
In that the meaning of parent.frame depends
The meaning of parent.frame depends on where it is evaluated. So one
should not expect it to do the same thing in two equivalent expressions
(and nor should one expect deparse to do so, for example).
A pretty close analogy is that using a symbolic link in a file system is
equivalent to using
In that the meaning of parent.frame depends on where it is
evaluated, is there a nice way to figure out which frame an express
is evaluated? for example, I would like to konw what does
parent.frame(2) refer to.
f1 - function(x,digits=5) lapply(x, f2)
f2 - function(x)
Hi,Gabor Grothendieck, Thanks very much.
On 5/27/07, Gabor Grothendieck [EMAIL PROTECTED] wrote:
evalq looks like this:
evalq
function (expr, envir, enclos)
eval.parent(substitute(eval(quote(expr), envir, enclos)))
environment: namespace:base
so it seems the difference is
On 5/27/07, ronggui [EMAIL PROTECTED] wrote:
Hi,Gabor Grothendieck, Thanks very much.
On 5/27/07, Gabor Grothendieck [EMAIL PROTECTED] wrote:
evalq looks like this:
evalq
function (expr, envir, enclos)
eval.parent(substitute(eval(quote(expr), envir, enclos)))
That's great. I got it. Million thanks.
On 5/28/07, Gabor Grothendieck [EMAIL PROTECTED] wrote:
On 5/27/07, ronggui [EMAIL PROTECTED] wrote:
Hi,Gabor Grothendieck, Thanks very much.
On 5/27/07, Gabor Grothendieck [EMAIL PROTECTED] wrote:
evalq looks like this:
evalq
How about 'traceback'? (It does not necesssarily show all the frames, but
it does help and the exceptions are fairly esoteric.)
On Mon, 28 May 2007, ronggui wrote:
In that the meaning of parent.frame depends on where it is
evaluated, is there a nice way to figure out which frame an express
The help page of eval says: The 'evalq' form is equivalent to
'eval(quote(expr), ...)'. But the following is not equivalent. Can
anyone give me some explaination? Thanks very much.
f1 - function(x,digits=5) lapply(x, f2)
f2 - function(x)
evalq looks like this:
evalq
function (expr, envir, enclos)
eval.parent(substitute(eval(quote(expr), envir, enclos)))
environment: namespace:base
so it seems the difference is that
- eval(quote(), envir, enclos) evaluates envir and enclos
in the current frame but
- evalq
