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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] sparse colwise
- From: Sameer Agarwal <sameeragarwal@xxxxxxxxxx>
- Date: Mon, 28 Jun 2010 06:56:41 -0700
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Thanks :)
Sameer
On Mon, Jun 28, 2010 at 4:46 AM, Gael Guennebaud
<gael.guennebaud@xxxxxxxxx> wrote:
> for your information, with -O2, gcc removes the multiplications by one :)
>
> gael
>
> On Fri, Jun 25, 2010 at 5:54 PM, Sameer Agarwal
> <sameeragarwal@xxxxxxxxxx> wrote:
>> I was hoping to avoid the multiplication.
>> Sameer
>>
>>
>> On Fri, Jun 25, 2010 at 8:41 AM, Gael Guennebaud
>> <gael.guennebaud@xxxxxxxxx> wrote:
>>> Hi,
>>>
>>> it's not a bug, but a lack of features.The sparse module does not
>>> support the full dense API. Column-wise and row-wise operations do not
>>> seem to be of high priority, but I agree that can be convenient.
>>>
>>> Note that you can still do:
>>>
>>> RowVectorXd::Ones(5) * m2
>>>
>>> Hopefully, the compiler should be smart enough to remove the products
>>> by 1 (well, maybe it is not allowed to do so by default....)
>>>
>>> gael
>>>
>>> On Fri, Jun 25, 2010 at 5:14 PM, Sameer Agarwal
>>> <sameeragarwal@xxxxxxxxxx> wrote:
>>>> Hi Guys,
>>>>
>>>> On the development branch,
>>>>
>>>> #include "Eigen/Core"
>>>> #include "Eigen/Sparse"
>>>>
>>>> using namespace Eigen;
>>>> int main() {
>>>> Matrix<double, Dynamic, Dynamic, ColMajor> m1(5,5);
>>>> SparseMatrix<double, ColMajor> m2(5,5);
>>>> m1.colwise().sum();
>>>> m2.colwise().sum() // Fails to compile
>>>> }
>>>>
>>>> fails to compile with
>>>>
>>>> 'class Eigen::SparseMatrix<double, 0, int>' has no member named 'colwise'
>>>>
>>>> am I missing something here?
>>>> Sameer
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>>
>
>
>