Re: [Boost-users] Question regarding ublas::identity_matrix

From: YYW (yyw1_25_at_[hidden])
Date: 2006-10-14 00:38:03

I see, thank you very much!
"Chris Weed" <chrisweed_at_[hidden]> 
??????:359e4bf50610131233j6ed7feet897c5fe03e60ca12_at_mail.gmail.com...
> This is probably so all the matrix classes have the same interface.
>
> This would allow functions on matrices to work generically for
> rect_matrix and identity_matrix.
>
> template<typename MatrixType>
> size_t num_elements(MatrixType m)
> {
> return m.size1()*m.size2();
> }
>
> identity_matrix i;
> rectangular_matrix r;
> std::cout << num_elements(i) << std::endl;
> std::cout << num_elements(r) << std::endl;
>
> Chris
>
> On 10/13/06, YYW <yyw1_25_at_[hidden]> wrote:
>> Hi all,
>> I'm a newcomer to uBlas.
>> Please consider the following code:
>>
>> identity_matrix<double> matI(3);
>> int row = matI.size1();
>> int col = matI.size2();
>>
>> now that matI has the same number of rows and columns, why the
>> identity_matrix template class has two "size" member functions: size1() 
>> and
>> size2()? And has two "size" member variables: size1_ and size2_? Why not 
>> use
>> just size() and size_?
>>
>>
>>
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>