Is there a way to use ALTREP with Rcpp?
1
Example:
// [[Rcpp::export]]
size_t z1(SEXP x) {
return Rf_xlength(x);
}
// [[Rcpp::export]]
size_t z2(NumericVector x) {
// do anything or nothing
return 1;
}
R:
x <- seq(1,1e10)
z1(x)
[1] 1e+10
z2(x)
# computer hard crash
Suppose as example, I just wanted to take the first 10 elements of an ALTREP vector. What would be the best way to do so in C++?
r rcpp altrep
asked Nov 13 '18 at 23:57
thcthc
4,82911124
|
show 1 more comment
1
Example:
// [[Rcpp::export]]
size_t z1(SEXP x) {
return Rf_xlength(x);
}
// [[Rcpp::export]]
size_t z2(NumericVector x) {
// do anything or nothing
return 1;
}
R:
x <- seq(1,1e10)
z1(x)
[1] 1e+10
z2(x)
# computer hard crash
Suppose as example, I just wanted to take the first 10 elements of an ALTREP vector. What would be the best way to do so in C++?
r rcpp altrep
asked Nov 13 '18 at 23:57
thcthc
4,82911124
2
This recent link might be appropriate: purrple.cat/blog/2018/10/14/altrep-and-cpp
– r2evans
Nov 14 '18 at 0:01
1
i) ALTREP is not released. ii) You can look at ChangeLog and NEWS.Rd and scan for ALTREP. There is nothing yet. For why see i) ;-) Help welcome. If you want to experiment, come to the rcpp-devel list and discuss. Last time I met Gabe / talked to Gabe his view still was that package would not have to do all that much. We'll see. I guess it will be more of a topic in 2019.
– Dirk Eddelbuettel
Nov 14 '18 at 0:05
Thanks Dirk, I was wondering if you or Romain would jump in quickly. It's been a low-priority lingering question I've had but didn't have the need to ask (yet).
– r2evans
Nov 14 '18 at 0:14
1
Sorry if I am misunderstanding, but in the change log of R 3.5.0 it says "Arithmetic sequences created by 1:n, seq_along, and the like now use compact internal representations via the ALTREP framework. " Doesn't that mean it is released?
– thc
Nov 14 '18 at 0:29
@thc: In the narrow sense the answer is of course YES. You can program anything you want with Rcpp. But if your question really is "does Rcpp currently contain ALTREP-aware interfaces" then the answer is no, as you can tell from the Rcpp NEWS and ChangeLog. As I said, likely in 2019. Or whenever someone (you?) starts on it.
– Dirk Eddelbuettel
Nov 14 '18 at 0:58
|
show 1 more comment
1
1
1
Example:
// [[Rcpp::export]]
size_t z1(SEXP x) {
return Rf_xlength(x);
}
// [[Rcpp::export]]
size_t z2(NumericVector x) {
// do anything or nothing
return 1;
}
R:
x <- seq(1,1e10)
z1(x)
[1] 1e+10
z2(x)
# computer hard crash
Suppose as example, I just wanted to take the first 10 elements of an ALTREP vector. What would be the best way to do so in C++?
r rcpp altrep
asked Nov 13 '18 at 23:57
thcthc
4,82911124
Example:
// [[Rcpp::export]]
size_t z1(SEXP x) {
return Rf_xlength(x);
}
// [[Rcpp::export]]
size_t z2(NumericVector x) {
// do anything or nothing
return 1;
}
R:
x <- seq(1,1e10)
z1(x)
[1] 1e+10
z2(x)
# computer hard crash
Suppose as example, I just wanted to take the first 10 elements of an ALTREP vector. What would be the best way to do so in C++?
r rcpp altrep
r rcpp altrep
asked Nov 13 '18 at 23:57
thcthc
4,82911124
asked Nov 13 '18 at 23:57
thcthc
4,82911124
asked Nov 13 '18 at 23:57
thcthc
4,82911124
asked Nov 13 '18 at 23:57
thcthc
4,82911124
asked Nov 13 '18 at 23:57
thcthc
4,82911124
4,82911124
2
This recent link might be appropriate: purrple.cat/blog/2018/10/14/altrep-and-cpp
– r2evans
Nov 14 '18 at 0:01
1
i) ALTREP is not released. ii) You can look at ChangeLog and NEWS.Rd and scan for ALTREP. There is nothing yet. For why see i) ;-) Help welcome. If you want to experiment, come to the rcpp-devel list and discuss. Last time I met Gabe / talked to Gabe his view still was that package would not have to do all that much. We'll see. I guess it will be more of a topic in 2019.
– Dirk Eddelbuettel
Nov 14 '18 at 0:05
Thanks Dirk, I was wondering if you or Romain would jump in quickly. It's been a low-priority lingering question I've had but didn't have the need to ask (yet).
– r2evans
Nov 14 '18 at 0:14
1
Sorry if I am misunderstanding, but in the change log of R 3.5.0 it says "Arithmetic sequences created by 1:n, seq_along, and the like now use compact internal representations via the ALTREP framework. " Doesn't that mean it is released?
– thc
Nov 14 '18 at 0:29
@thc: In the narrow sense the answer is of course YES. You can program anything you want with Rcpp. But if your question really is "does Rcpp currently contain ALTREP-aware interfaces" then the answer is no, as you can tell from the Rcpp NEWS and ChangeLog. As I said, likely in 2019. Or whenever someone (you?) starts on it.
– Dirk Eddelbuettel
Nov 14 '18 at 0:58
|
show 1 more comment
2
This recent link might be appropriate: purrple.cat/blog/2018/10/14/altrep-and-cpp
– r2evans
Nov 14 '18 at 0:01
1
i) ALTREP is not released. ii) You can look at ChangeLog and NEWS.Rd and scan for ALTREP. There is nothing yet. For why see i) ;-) Help welcome. If you want to experiment, come to the rcpp-devel list and discuss. Last time I met Gabe / talked to Gabe his view still was that package would not have to do all that much. We'll see. I guess it will be more of a topic in 2019.
– Dirk Eddelbuettel
Nov 14 '18 at 0:05
Thanks Dirk, I was wondering if you or Romain would jump in quickly. It's been a low-priority lingering question I've had but didn't have the need to ask (yet).
– r2evans
Nov 14 '18 at 0:14
1
Sorry if I am misunderstanding, but in the change log of R 3.5.0 it says "Arithmetic sequences created by 1:n, seq_along, and the like now use compact internal representations via the ALTREP framework. " Doesn't that mean it is released?
– thc
Nov 14 '18 at 0:29
@thc: In the narrow sense the answer is of course YES. You can program anything you want with Rcpp. But if your question really is "does Rcpp currently contain ALTREP-aware interfaces" then the answer is no, as you can tell from the Rcpp NEWS and ChangeLog. As I said, likely in 2019. Or whenever someone (you?) starts on it.
– Dirk Eddelbuettel
Nov 14 '18 at 0:58
2
2
This recent link might be appropriate: purrple.cat/blog/2018/10/14/altrep-and-cpp
– r2evans
Nov 14 '18 at 0:01
This recent link might be appropriate: purrple.cat/blog/2018/10/14/altrep-and-cpp
– r2evans
Nov 14 '18 at 0:01
1
1
i) ALTREP is not released. ii) You can look at ChangeLog and NEWS.Rd and scan for ALTREP. There is nothing yet. For why see i) ;-) Help welcome. If you want to experiment, come to the rcpp-devel list and discuss. Last time I met Gabe / talked to Gabe his view still was that package would not have to do all that much. We'll see. I guess it will be more of a topic in 2019.
– Dirk Eddelbuettel
Nov 14 '18 at 0:05
i) ALTREP is not released. ii) You can look at ChangeLog and NEWS.Rd and scan for ALTREP. There is nothing yet. For why see i) ;-) Help welcome. If you want to experiment, come to the rcpp-devel list and discuss. Last time I met Gabe / talked to Gabe his view still was that package would not have to do all that much. We'll see. I guess it will be more of a topic in 2019.
– Dirk Eddelbuettel
Nov 14 '18 at 0:05
Thanks Dirk, I was wondering if you or Romain would jump in quickly. It's been a low-priority lingering question I've had but didn't have the need to ask (yet).
– r2evans
Nov 14 '18 at 0:14
Thanks Dirk, I was wondering if you or Romain would jump in quickly. It's been a low-priority lingering question I've had but didn't have the need to ask (yet).
– r2evans
Nov 14 '18 at 0:14
1
1
Sorry if I am misunderstanding, but in the change log of R 3.5.0 it says "Arithmetic sequences created by 1:n, seq_along, and the like now use compact internal representations via the ALTREP framework. " Doesn't that mean it is released?
– thc
Nov 14 '18 at 0:29
Sorry if I am misunderstanding, but in the change log of R 3.5.0 it says "Arithmetic sequences created by 1:n, seq_along, and the like now use compact internal representations via the ALTREP framework. " Doesn't that mean it is released?
– thc
Nov 14 '18 at 0:29
@thc: In the narrow sense the answer is of course YES. You can program anything you want with Rcpp. But if your question really is "does Rcpp currently contain ALTREP-aware interfaces" then the answer is no, as you can tell from the Rcpp NEWS and ChangeLog. As I said, likely in 2019. Or whenever someone (you?) starts on it.
– Dirk Eddelbuettel
Nov 14 '18 at 0:58
@thc: In the narrow sense the answer is of course YES. You can program anything you want with Rcpp. But if your question really is "does Rcpp currently contain ALTREP-aware interfaces" then the answer is no, as you can tell from the Rcpp NEWS and ChangeLog. As I said, likely in 2019. Or whenever someone (you?) starts on it.
– Dirk Eddelbuettel
Nov 14 '18 at 0:58
|
show 1 more comment
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2
This recent link might be appropriate: purrple.cat/blog/2018/10/14/altrep-and-cpp
– r2evans
Nov 14 '18 at 0:01
1
i) ALTREP is not released. ii) You can look at ChangeLog and NEWS.Rd and scan for ALTREP. There is nothing yet. For why see i) ;-) Help welcome. If you want to experiment, come to the rcpp-devel list and discuss. Last time I met Gabe / talked to Gabe his view still was that package would not have to do all that much. We'll see. I guess it will be more of a topic in 2019.
– Dirk Eddelbuettel
Nov 14 '18 at 0:05
Thanks Dirk, I was wondering if you or Romain would jump in quickly. It's been a low-priority lingering question I've had but didn't have the need to ask (yet).
– r2evans
Nov 14 '18 at 0:14
1
Sorry if I am misunderstanding, but in the change log of R 3.5.0 it says "Arithmetic sequences created by 1:n, seq_along, and the like now use compact internal representations via the ALTREP framework. " Doesn't that mean it is released?
– thc
Nov 14 '18 at 0:29
@thc: In the narrow sense the answer is of course YES. You can program anything you want with Rcpp. But if your question really is "does Rcpp currently contain ALTREP-aware interfaces" then the answer is no, as you can tell from the Rcpp NEWS and ChangeLog. As I said, likely in 2019. Or whenever someone (you?) starts on it.
– Dirk Eddelbuettel
Nov 14 '18 at 0:58