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Posted to dev@commons.apache.org by Greg Sterijevski <gs...@gmail.com> on 2011/08/23 20:45:10 UTC
[math] EigenDecompositionImpl
Hello All,
Since math gives eigendecomposition for symmetrics, why even allocate the
array imagEigenvalues ?
What am I missing?
Thanks,
-Greg
Re: [math] EigenDecompositionImpl
Posted by Luc Maisonobe <Lu...@free.fr>.
Le 24/08/2011 00:59, Greg Sterijevski a écrit :
> Should I open a ticket, or do you want to handle this?
Please open a ticket.
For the moment, I am busy in other parts (integration, geometry and ODE)
and don't fiddle with linear algebra.
Luc
>
> On Tue, Aug 23, 2011 at 5:47 PM, Luc Maisonobe<Lu...@free.fr>wrote:
>
>> Le 24/08/2011 00:44, Greg Sterijevski a écrit :
>>
>> I understand you want to support the general case, but why should it
>>> necessitate instantiating a ref.
>>>
>>
>> You are right, we could go with an array allocated only upon request.
>>
>> Luc
>>
>>
>>> On Tue, Aug 23, 2011 at 5:29 PM, Luc Maisonobe<Lu...@free.fr>
>>>> wrote:
>>>
>>> Le 23/08/2011 20:45, Greg Sterijevski a écrit :
>>>>
>>>> Hello All,
>>>>
>>>>>
>>>>> Since math gives eigendecomposition for symmetrics, why even allocate
>>>>> the
>>>>> array imagEigenvalues ?
>>>>> What am I missing?
>>>>>
>>>>>
>>>> For now, we are limited to symmetric matrices because we did not
>>>> implement
>>>> anything else. However, we did prepare the interface for this, so we have
>>>> to
>>>> implement the getImageEigenValues method, and hence we need an array.
>>>>
>>>> Luc
>>>>
>>>>
>>>> Thanks,
>>>>>
>>>>> -Greg
>>>>>
>>>>>
>>>>>
>>>> ------------------------------****----------------------------**
>>>> --**---------
>>>> To unsubscribe, e-mail: dev-unsubscribe@commons.**apac**he.org<http://apache.org>
>>>> <de...@commons.apache.org>
>>>>>
>>>>
>>>> For additional commands, e-mail: dev-help@commons.apache.org
>>>>
>>>>
>>>>
>>>
>>
>> ------------------------------**------------------------------**---------
>> To unsubscribe, e-mail: dev-unsubscribe@commons.**apache.org<de...@commons.apache.org>
>> For additional commands, e-mail: dev-help@commons.apache.org
>>
>>
>
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Re: [math] EigenDecompositionImpl
Posted by Greg Sterijevski <gs...@gmail.com>.
Should I open a ticket, or do you want to handle this?
On Tue, Aug 23, 2011 at 5:47 PM, Luc Maisonobe <Lu...@free.fr>wrote:
> Le 24/08/2011 00:44, Greg Sterijevski a écrit :
>
> I understand you want to support the general case, but why should it
>> necessitate instantiating a ref.
>>
>
> You are right, we could go with an array allocated only upon request.
>
> Luc
>
>
>> On Tue, Aug 23, 2011 at 5:29 PM, Luc Maisonobe<Lu...@free.fr>
>> >wrote:
>>
>> Le 23/08/2011 20:45, Greg Sterijevski a écrit :
>>>
>>> Hello All,
>>>
>>>>
>>>> Since math gives eigendecomposition for symmetrics, why even allocate
>>>> the
>>>> array imagEigenvalues ?
>>>> What am I missing?
>>>>
>>>>
>>> For now, we are limited to symmetric matrices because we did not
>>> implement
>>> anything else. However, we did prepare the interface for this, so we have
>>> to
>>> implement the getImageEigenValues method, and hence we need an array.
>>>
>>> Luc
>>>
>>>
>>> Thanks,
>>>>
>>>> -Greg
>>>>
>>>>
>>>>
>>> ------------------------------****----------------------------**
>>> --**---------
>>> To unsubscribe, e-mail: dev-unsubscribe@commons.**apac**he.org<http://apache.org>
>>> <de...@commons.apache.org>
>>> >
>>>
>>> For additional commands, e-mail: dev-help@commons.apache.org
>>>
>>>
>>>
>>
>
> ------------------------------**------------------------------**---------
> To unsubscribe, e-mail: dev-unsubscribe@commons.**apache.org<de...@commons.apache.org>
> For additional commands, e-mail: dev-help@commons.apache.org
>
>
Re: [math] EigenDecompositionImpl
Posted by Luc Maisonobe <Lu...@free.fr>.
Le 24/08/2011 00:44, Greg Sterijevski a écrit :
> I understand you want to support the general case, but why should it
> necessitate instantiating a ref.
You are right, we could go with an array allocated only upon request.
Luc
>
> On Tue, Aug 23, 2011 at 5:29 PM, Luc Maisonobe<Lu...@free.fr>wrote:
>
>> Le 23/08/2011 20:45, Greg Sterijevski a écrit :
>>
>> Hello All,
>>>
>>> Since math gives eigendecomposition for symmetrics, why even allocate the
>>> array imagEigenvalues ?
>>> What am I missing?
>>>
>>
>> For now, we are limited to symmetric matrices because we did not implement
>> anything else. However, we did prepare the interface for this, so we have to
>> implement the getImageEigenValues method, and hence we need an array.
>>
>> Luc
>>
>>
>>> Thanks,
>>>
>>> -Greg
>>>
>>>
>>
>> ------------------------------**------------------------------**---------
>> To unsubscribe, e-mail: dev-unsubscribe@commons.**apache.org<de...@commons.apache.org>
>> For additional commands, e-mail: dev-help@commons.apache.org
>>
>>
>
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Re: [math] EigenDecompositionImpl
Posted by Greg Sterijevski <gs...@gmail.com>.
I understand you want to support the general case, but why should it
necessitate instantiating a ref.
On Tue, Aug 23, 2011 at 5:29 PM, Luc Maisonobe <Lu...@free.fr>wrote:
> Le 23/08/2011 20:45, Greg Sterijevski a écrit :
>
> Hello All,
>>
>> Since math gives eigendecomposition for symmetrics, why even allocate the
>> array imagEigenvalues ?
>> What am I missing?
>>
>
> For now, we are limited to symmetric matrices because we did not implement
> anything else. However, we did prepare the interface for this, so we have to
> implement the getImageEigenValues method, and hence we need an array.
>
> Luc
>
>
>> Thanks,
>>
>> -Greg
>>
>>
>
> ------------------------------**------------------------------**---------
> To unsubscribe, e-mail: dev-unsubscribe@commons.**apache.org<de...@commons.apache.org>
> For additional commands, e-mail: dev-help@commons.apache.org
>
>
Re: [math] EigenDecompositionImpl
Posted by Luc Maisonobe <Lu...@free.fr>.
Le 23/08/2011 20:45, Greg Sterijevski a écrit :
> Hello All,
>
> Since math gives eigendecomposition for symmetrics, why even allocate the
> array imagEigenvalues ?
> What am I missing?
For now, we are limited to symmetric matrices because we did not
implement anything else. However, we did prepare the interface for this,
so we have to implement the getImageEigenValues method, and hence we
need an array.
Luc
>
> Thanks,
>
> -Greg
>
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