Re: [ublas] sparse iterative eigensolver

From: Matthias Troyer (troyer_at_[hidden])
Date: 2006-03-08 12:28:41

Hi Eitan,

Which matrix class do you use?

Matthias

On Mar 8, 2006, at 4:27 PM, eeitan_at_[hidden] wrote:

>
> thanks for your answear. i am using ublas with ietl::lanczos to get  
> lowest
> eigen-pair and its takes much more time than using lapack to get all
> eigen-pairs ( i am talking about sparse matrices 4000x4000 but my  
> plan is to
> work with much larger)
> eitan
> Quoting Matthias Troyer <troyer_at_[hidden]>:
>
>> Hi Eeitan,
>>
>> The performance of IETL depends *only* on the performance of the
>> underlying matrix/vector library. The time spent in the actual IETL
>> functions is negligible. If you see any bad performance when using
>> IETL with a specific linear algebra library, then it is because of
>> that library.
>>
>> Matthias
>>
>> On Feb 20, 2006, at 3:45 AM, eeitan_at_[hidden] wrote:
>>
>>>
>>> hello, is someone knows a good package that uses UBLAS ,for
>>> calculating
>>> eigenvalues & eigenvectors for sparse matrices?? ( i tried IETL but
>>> their
>>> performance is poor as far as i can see) .
>>> thanks eitan.
>>>
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