Re: [Rcpp-devel] lmBenchmark broken for RcppArmadillo?
I've confirmed that this works on R 3.1.1 under OS X, using RcppArmadillo
0.4.450.1.0:
*diff --git a/inst/examples/lmBenchmark.R b/inst/examples/lmBenchmark.R*
*index 9037107..dd49375 100644*
*--- a/inst/examples/lmBenchmark.R*
*+++ b/inst/examples/lmBenchmark.R*
@@ -37,7 +37,7 @@ exprs$QR <- expression(.Call("fastLm", mm, y, 1L,
PACKAGE="Rcp
exprs$LLt <- expression(.Call("fastLm", mm, y, 3L, PACKAGE="RcppEigen"))
if (suppressMessages(require("RcppArmadillo", character=TRUE,
quietly=TRUE))) {
-exprs$arma <- expression(.Call("fastLm", mm, y,
PACKAGE="RcppArmadillo"))
+exprs$arma <- expression(.Call("RcppArmadillo_fastLm", mm, y,
PACKAGE="Rcpp
}
if (suppressMessages(require("RcppGSL", character=TRUE, quietly=TRUE))) {
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Re: [Rcpp-devel] lmBenchmark broken for RcppArmadillo?
On 20 October 2014 at 12:26, Matt wrote:
| I've confirmed that this works on R 3.1.1 under OS X, using RcppArmadillo
| 0.4.450.1.0:
Thanks for testing / conforming, and of course for having alterted us in the
first place -- I am updating the example code.
Dirk
|
|
| diff --git a/inst/examples/lmBenchmark.R b/inst/examples/lmBenchmark.R
|
| index 9037107..dd49375 100644
|
| --- a/inst/examples/lmBenchmark.R
|
| +++ b/inst/examples/lmBenchmark.R
|
| @@ -37,7 +37,7 @@ exprs$QR <- expression(.Call("fastLm", mm, y, 1L, PACKAGE=
| "Rcp
|
| exprs$LLt <- expression(.Call("fastLm", mm, y, 3L, PACKAGE="RcppEigen"))
|
|
|
| if (suppressMessages(require("RcppArmadillo", character=TRUE, quietly=TRUE)))
| {
|
| - exprs$arma <- expression(.Call("fastLm", mm, y, PACKAGE="RcppArmadillo"))
|
| + exprs$arma <- expression(.Call("RcppArmadillo_fastLm", mm, y, PACKAGE=
| "Rcpp
|
| }
|
|
|
| if (suppressMessages(require("RcppGSL", character=TRUE, quietly=TRUE))) {
|
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[Rcpp-devel] convert to unsigned char* variable
Hi
Im trying to use some C++ functions in R. However, these functions are
build around unsigned char* variables (1D array). I have for example a
large matrix in R that represents black (e.g. 1-bit image, 0 and 1s). I
cant find a solution to convert a character vector into unsigned char*
within Rcpp. Im new to Rcpp and C++ so I might have missed something
obvious here. Please direct me to resources on this topic (google did
not help much).
A start:
SEXP test(SEXP cM){
CharacterVector Vc(cM);
int n = Vr.size();
RawVector x(n); //is this the same as unsigned char* ?
//I tried to fill it with char*(Mr) but I
didnt succeed
}
Thanks,
Gustaf
--
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Post doc
McMaster University
School of Geography & Earth Sciences
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Re: [Rcpp-devel] convert to unsigned char* variable
Hi Gustaf,
On 20 October 2014 at 15:17, Gustaf Granath wrote:
| Im trying to use some C++ functions in R. However, these functions are
| build around unsigned char* variables (1D array). I have for example a
| large matrix in R that represents black (e.g. 1-bit image, 0 and 1s). I
| cant find a solution to convert a character vector into unsigned char*
| within Rcpp. Im new to Rcpp and C++ so I might have missed something
Rcpp builds a bridge between R and C++, and supports (in C++) the types that
R supports. Eg you won't find 'float' but only 'double' as that is what R
does.
Here you will get character vectors easily. If they must be unsigned char,
you will probably have to cast them at the C++ level.
| obvious here. Please direct me to resources on this topic (google did
| not help much).
|
| A start:
|
| SEXP test(SEXP cM){
|CharacterVector Vc(cM);
|int n = Vr.size();
|RawVector x(n); //is this the same as unsigned char* ?
No, RawVector is for R 'raw' types -- see help("raw") in R,
Dirk
| //I tried to fill it with char*(Mr) but I
| didnt succeed
| }
|
| Thanks,
|
| Gustaf
|
| --
| Gustaf Granath (PhD)
| Post doc
| McMaster University
| School of Geography & Earth Sciences
|
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Re: [Rcpp-devel] convert to unsigned char* variable
> Le 20 oct. 2014 à 21:54, Dirk Eddelbuettel a écrit :
>
>
> Hi Gustaf,
>
> On 20 October 2014 at 15:17, Gustaf Granath wrote:
> | Im trying to use some C++ functions in R. However, these functions are
> | build around unsigned char* variables (1D array). I have for example a
> | large matrix in R that represents black (e.g. 1-bit image, 0 and 1s). I
> | cant find a solution to convert a character vector into unsigned char*
> | within Rcpp. Im new to Rcpp and C++ so I might have missed something
>
> Rcpp builds a bridge between R and C++, and supports (in C++) the types that
> R supports. Eg you won't find 'float' but only 'double' as that is what R
> does.
>
> Here you will get character vectors easily. If they must be unsigned char,
> you will probably have to cast them at the C++ level.
>
> | obvious here. Please direct me to resources on this topic (google did
> | not help much).
> |
> | A start:
> |
> | SEXP test(SEXP cM){
> |CharacterVector Vc(cM);
> |int n = Vr.size();
> |RawVector x(n); //is this the same as unsigned char* ?
>
> No, RawVector is for R 'raw' types -- see help("raw") in R,
Guess what raw is !!!
> demangle( "RawVector::stored_type" )
[1] "unsigned char"
> Dirk
>
> | //I tried to fill it with char*(Mr) but I
> | didnt succeed
> | }
> |
> | Thanks,
> |
> | Gustaf
> |
> | --
> | Gustaf Granath (PhD)
> | Post doc
> | McMaster University
> | School of Geography & Earth Sciences
> |
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>
> --
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Re: [Rcpp-devel] convert to unsigned char* variable
Hi,
that's not going to fly.
A CharacterVector holds strings of arbitrary lengths, well technically it holds
other R objects (SEXP) that hold pointers to strings.
A RawVector holds unsigned char.
Can you add some meat to your example, e.g. what you'd expect to go in, etc ...
Romain
> Le 20 oct. 2014 à 21:17, Gustaf Granath a écrit :
>
> Hi
> Im trying to use some C++ functions in R. However, these functions are build
> around unsigned char* variables (1D array). I have for example a large matrix
> in R that represents black (e.g. 1-bit image, 0 and 1s). I cant find a
> solution to convert a character vector into unsigned char* within Rcpp. Im
> new to Rcpp and C++ so I might have missed something obvious here. Please
> direct me to resources on this topic (google did not help much).
>
> A start:
>
> SEXP test(SEXP cM){
> CharacterVector Vc(cM);
> int n = Vr.size();
> RawVector x(n); //is this the same as unsigned char* ?
>//I tried to fill it with char*(Mr) but I didnt
> succeed
> }
>
> Thanks,
>
> Gustaf
>
> --
> Gustaf Granath (PhD)
> Post doc
> McMaster University
> School of Geography & Earth Sciences
>
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Re: [Rcpp-devel] convert to unsigned char* variable
On 20 October 2014 at 23:09, Romain Francois wrote:
| > Le 20 oct. 2014 à 21:54, Dirk Eddelbuettel a écrit :
| > No, RawVector is for R 'raw' types -- see help("raw") in R,
|
| Guess what raw is !!!
|
| > demangle( "RawVector::stored_type" )
| [1] "unsigned char"
Touche, but for all uses I have seen (eg around serialization) raw was not
meant as the type Gustaf implied in his question. Then again Gustaf's post
was a little short on specifics ...
Dirk
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