Hi, > Fair enough, thank you Karl. One follow-up question, where is this in > the documentation? I am trying to get a feel of where everything is so > I don't have to ask these simple questions on here.
This is listed in the 'Basic Operations'-Chapter: http://viennacl.sourceforge.net/doc/manual-operations.html#manual-operations-row-column-diagonal All supported operations are supposed to be described in the 'User Manual'. With the operator-overloading in C++ it is not easy to list all available operation in e.g. a single large table of function names. If you have suggestions for further improvements, please let us know. :-) Best regards, Karli > On Mon, Aug 17, 2015 at 8:15 AM, Karl Rupp <r...@iue.tuwien.ac.at > <mailto:r...@iue.tuwien.ac.at>> wrote: > > Hi Charles, > > you can extract the row or column of a matrix using viennacl::row() > and viennacl::column(), e.g. > > viennacl::matrix<T> A(N, N); > viennacl::vector<T> x(N); > > x = viennacl::row(A, 2); > x = viennacl::column(A, 3); > > The assignment of a vector to a matrix row or matrix column is more > involved, though... > > In either case you really want to iterate over elements and use > per-element access. This is because each access entails a > host<->device communication, which is very costly with CUDA and OpenCL. > > Best regards, > Karli > > > > > On 08/17/2015 03:08 PM, Charles Determan wrote: > > I have seen in the documentation that it is simple to access an > individual element in a viennacl::matrix with > > mat(i,j) > > but how could I access an entire row or column? Is there > similar syntax > or would I need to iterate over each element of a row/column? > > Thanks, > Charles > > > > ------------------------------------------------------------------------------ > > > > _______________________________________________ > ViennaCL-devel mailing list > ViennaCL-devel@lists.sourceforge.net > <mailto:ViennaCL-devel@lists.sourceforge.net> > https://lists.sourceforge.net/lists/listinfo/viennacl-devel > > > ------------------------------------------------------------------------------ _______________________________________________ ViennaCL-devel mailing list ViennaCL-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/viennacl-devel
