Re: [ViennaCL-devel] Proxy of Compressed Matrix

[Karl R. <ru...@iu...>]

Hi Charles,

no, there is currently no way of extracting a submatrix from a sparse 
matrix.

I agree that it is useful in some circumstances to *extract* a 
submatrix, but the type system and boilerplate required to fully deal 
with things like
   prod(matrix_range(A, rows, cols), matrix_range(B, rows, cols));
is outright scary.

Best regards,
Karli



On 06/12/2018 07:24 PM, Charles Determan wrote:
> Greetings,
> 
> Is there a way to take proxy (i.e. matrix_range) subsets of 
> compressed_matrix objects?
> 
> Currently, when I try to compile the g++ returns an error:
> 
> error: no type named 'cpu_value_type' in 'class 
> viennacl::compressed_matrix<float>'
>     typedef matrix_base<typename MatrixType::cpu_value_type>    base_type;
> 
> I want to make sure if I am making a simple mistake or if this is 
> currently not possible.
> 
> Thanks,
> Chaz
> 
> 
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