Not a question here, but a note. Earlier there was an email about filling
a NumericMatrix row by row.
http://lists.r-forge.r-project.org/pipermail/rcpp-devel/2013-March/005390.html
I noticed that for Rcpp 0.10.2 it was possible to fill a NumericMatrix with
NumericVectors, but since Rcpp 0.10.3
There's an even simpler way when using Armadillo, so that no loop is required:
http://arma.sourceforge.net/docs.html#each_colrow
For example:
mat X(4,5);
rowvec r(5);
X.each_row() = r;
(btw, in general it's more efficient to access matrices as columns
rather than rows).
On Wed, Mar 27, 2013
I removed it in the revision 4294. Sorry for the inconvenience.
Romain
Le 27/03/13 09:23, Michael Love a écrit :
Not a question here, but a note. Earlier there was an email about
filling a NumericMatrix row by row.
Thanks for the reply and great libraries Conrad and Romain.
Conrad, my example is a bit too simple maybe, I am really doing:
for i from 1 to m:
do computation
store a row of results into a tall m x n matrix
...where i am pretty sure that the time required for computation is more
than
On 27 March 2013 at 12:06, Michael Love wrote:
| Thanks for the reply and great libraries Conrad and Romain.
|
| Conrad, my example is a bit too simple maybe, I am really doing:
|
| for i from 1 to m:
| do computation
| store a row of results into a tall m x n matrix
|
| ...where i am
