On Sun, 11 Apr 2004, Shin, Daehyok wrote:
> Thanks, Andy.
> Let me ask a little more about the DUP argument.
> In the manual, I can see that only reference copy happens when passing an
> array,
> if DUP=FALSE. Then, what happens when returning it in a list, if DUP=FALSE?
> Another reference copy,
On Sun, 11 Apr 2004 21:43:58 -0400, you wrote:
>For me it's just a matter of getting my hands dirty, I guess. For whatever
>reason I seem to have a mental block about the PROTECT/UNPROTECT business...
Just protect every SEXP until you don't care if it goes away. It
might be possible to skip som
ROTECTED]
> Sent: Sunday, April 11, 2004 PM 9:35
> To: Liaw, Andy
> Cc: '[EMAIL PROTECTED]'; Liaw, Andy; R, Help
> Subject: Re: [R] Only referenc copy when calling C routine?
>
>
> On Sun, 11 Apr 2004 21:25:13 -0400, you wrote:
>
> >My understanding is that
For me it's just a matter of getting my hands dirty, I guess. For whatever
reason I seem to have a mental block about the PROTECT/UNPROTECT business...
Best,
Andy
> From: Duncan Murdoch [mailto:[EMAIL PROTECTED]
>
> On Sun, 11 Apr 2004 21:25:13 -0400, you wrote:
>
> >My understanding is that
On Sun, 11 Apr 2004 21:25:13 -0400, you wrote:
>My understanding is that if DUP=FALSE, no copying is done in either
>direction.
>
>If you want to avoid copying, the .Call interface is probably more suitable,
>as you pass the actual R objects to the C function. I'm not familiar with
>that, though.
My understanding is that if DUP=FALSE, no copying is done in either
direction.
If you want to avoid copying, the .Call interface is probably more suitable,
as you pass the actual R objects to the C function. I'm not familiar with
that, though.
Andy
> From: Shin, Daehyok [mailto:[EMAIL PROTECTED
Thanks, Andy.
Let me ask a little more about the DUP argument.
In the manual, I can see that only reference copy happens when passing an
array,
if DUP=FALSE. Then, what happens when returning it in a list, if DUP=FALSE?
Another reference copy, or deep copy?
I am trying to implement a dynamic model
I thought that description is rather clear. If `x' is a vector of doubles,
then
result <- .C("myCfunc", x = x)
makes a copy of `x' to be passed to `myfunc'. The copy in R is not touched.
When `myfunc' returns, another copy is made and placed into result[["x"]].
There's the `DUP' argument in .C
