Thanks for the conclusive example :)
baptiste
On 12 August 2010 21:53, Dirk Eddelbuettel wrote:
>
> On 12 August 2010 at 20:59, baptiste auguie wrote:
> | Point well taken, l'll try to use const and const& wherever appropriate.
>
> I am coming to this late (sorry, too much other stuff going on
On 12 August 2010 at 20:59, baptiste auguie wrote:
| Point well taken, l'll try to use const and const& wherever appropriate.
I am coming to this late (sorry, too much other stuff going on...) but I had
meant to illustrate the good advise provided by Davor and Romain. So here is
a stylized Armad
Point well taken, l'll try to use const and const& wherever appropriate.
Thanks,
baptiste
On 11 August 2010 23:55, Davor Cubranic wrote:
> As Romain said, there can be some hidden optimization going on, or the
> difference is not significant compared to the cost of the rest of the
> code.
>
As Romain said, there can be some hidden optimization going on, or the
difference is not significant compared to the cost of the rest of the
code.
But C++ best practice would recommend that you write this particular
function as you did in dum2, not dum1. It may not matter in this case,
but it
"disguise" might be a more appropriate name? I like the idea.
Thanks,
baptiste
On 11 August 2010 21:59, Romain Francois wrote:
> Hi,
>
> For one thing, the construct :
>
> arma::mat B = Rcpp::as< arma::mat>( A ) ;
>
> probably makes copies along the way. I'm not sure what right now, but we
>
Hi,
For one thing, the construct :
arma::mat B = Rcpp::as< arma::mat>( A ) ;
probably makes copies along the way. I'm not sure what right now, but we
might a different construct, something like:
arma::mat B ;
Rcpp::borrow( B, A ) ;
where borrow would have this signature perhaps
template
I think I understand the principle, however with my best effort I
cannot find a test case. Here I thought I'd be passing an arbitrarily
large arma matrix to some function, but again the timing is not
convincing (in fact, I had to stop the execution once with the dummy2
version),
using namespace Rc
On August 11, 2010 02:48:23 am rom...@r-enthusiasts.com wrote:
> Le 10 août 2010 à 22:10, baptiste auguie
a écrit :
> > OK, thanks. I have not been able to produce a minimal code that
> > would exhibit an improved performance using this
> > passing-by-reference idea.
>
> Hi,
>
> It would usuall
Le 10 août 2010 à 22:10, baptiste auguie a
écrit :
> Hi,
>
> On 10 August 2010 07:51, Romain Francois wrote:
>> Le 10/08/10 07:35, baptiste auguie a écrit :
>>>
>>> I see –– thanks for the clarification (it is indeed what Dirk really
>>> had suggested, the accidental shortcut was mine). T
Hi,
On 10 August 2010 07:51, Romain Francois wrote:
> Le 10/08/10 07:35, baptiste auguie a écrit :
>>
>> I see –– thanks for the clarification (it is indeed what Dirk really
>> had suggested, the accidental shortcut was mine). This passing by
>> reference seems very interesting (I pass several la
Le 10/08/10 07:35, baptiste auguie a écrit :
I see –– thanks for the clarification (it is indeed what Dirk really
had suggested, the accidental shortcut was mine). This passing by
reference seems very interesting (I pass several large complex arma
matrices in other functions), but I need to work
I see –– thanks for the clarification (it is indeed what Dirk really
had suggested, the accidental shortcut was mine). This passing by
reference seems very interesting (I pass several large complex arma
matrices in other functions), but I need to work out how it works
inside the functions.
Thanks
On 2010-08-07, at 7:03 PM, baptiste auguie wrote:
> Thanks Davor, Douglas and Dirk –– all your comments have been very
> helpful and I used them to improve my code (along with getting a
> better understanding of C++). The only thing I haven't tried yet is
> avoid duplicating the objects in memory
I tried compiling this function with various gcc optimization switches. The
results of my experiment are mixed. For most commonly-used optimization
switches (-On for n=0..3, even -fast), I could see multiple calls to 'cos' with
repeated same arguments, directly corresponding to the expressions i
Thanks Davor, Douglas and Dirk –– all your comments have been very
helpful and I used them to improve my code (along with getting a
better understanding of C++). The only thing I haven't tried yet is
avoid duplicating the objects in memory using const (seems tricky from
what I read on the net).
Al
On August 6, 2010 02:44:00 pm Douglas Bates wrote:
> On Fri, Aug 6, 2010 at 3:14 PM, baptiste auguie
>
> > arma::mat euler(double phi, double theta, double psi)
> > {
> >arma::mat Rot(3,3);
> >Rot(0,0) = cos(psi)*cos(phi) - cos(theta)*sin(phi)*sin(psi);
> >Rot(0,1) = cos(psi)*sin(phi
On Fri, Aug 6, 2010 at 3:14 PM, baptiste auguie
wrote:
> Dear all,
> In a package using RcppArmadillo I define several functions that use
> the same piece of c++ code. For instance, several functions use a
> rotation matrix constructed from 3 angles. I am considering the
> following idea: 1) defi
Dear all,
In a package using RcppArmadillo I define several functions that use
the same piece of c++ code. For instance, several functions use a
rotation matrix constructed from 3 angles. I am considering the
following idea: 1) define a routine that performs the calculations; 2)
create a wrapper i
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