Okay, I just wanted to make sure I understood how resize currently works.
Regarding an interface, the simplest I would imagine something along the
lines of a flag for resize for example:
vclA.resize(0) - default for adding to right
vclA.resize(1) - default for adding to left
but perhaps a more distinct flag such as 'L' or 'R'?
This isn't a big deal given how `resize` currently works. On that note, it
may be something to consider is a `conservativeResize` function (similar to
the Eigen library
http://eigen.tuxfamily.org/dox/classEigen_1_1PlainObjectBase.html#ae238393021f2b8298b1fb1c094ccb290).
Not sure how this would work with the object in GPU memory but something to
consider.
Regards,
Charles
On Wed, Jan 20, 2016 at 1:25 PM, Karl Rupp <r...@iue.tuwien.ac.at> wrote:
> Hi Charles,
>
> > Okay, I thought that would be a workaround. Does the current `resize`
>
>> method create a copy of the matrix internally as well? Ideally one
>> could resize without the copying overhead.
>>
>
> The resize() method allocates a new buffer and copies over the old
> entries. Pretty much the same as in the workaround solution I suggested.
>
> Also, would you consider this as new functionality to be added in the
>> future? If so I can create a new github issue but if not, this
>> workaround should be sufficient unless there is a way to avoid the
>> aforementioned copy overhead.
>>
>
> Do you happen to have a suggestion for an intuitive interface? I can't
> think of a good one, so I'd rather leave it as-is with the explicit copying
> as suggested.
>
> Best regards,
> Karli
>
>
>
> On Wed, Jan 20, 2016 at 11:08 AM, Karl Rupp <r...@iue.tuwien.ac.at
>> <mailto:r...@iue.tuwien.ac.at>> wrote:
>>
>> Hi Charles,
>>
>> > I can easily resize a matrix with the `resize` function
>>
>>
>> viennacl::matrix vcl_A(3,3);
>> vcl_A.resize(3,4);
>>
>> but I notice that this adds the new column on the end of the
>> matrix. Is
>> there a way to append it on to the front of the matrix?
>>
>>
>> Not directly. But you can create a new matrix and then use
>> viennacl::project() to place the old entries at the correct spot:
>>
>> matrix<T> B(3,4);
>> matrix_range<matrix<T> > B_right(B, range(0, 3), range(1,4));
>> B_right = A;
>>
>>
>>
>> Best regards,
>> Karli
>>
>>
>>
>
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