[R] LR Decomposition?
Berend Hasselman
bhh at xs4all.nl
Mon Jun 23 19:26:25 CEST 2008
Roy Mendelssohn wrote:
>
> Hi All:
>
>
> On Jun 23, 2008, at 9:53 AM, Berend Hasselman wrote:
>
>> Jeffrey Spies wrote:
>>>
>>> Hi all,
>>>
>>> Is there an LR decomposition function in R and, if not, how can we
>>> get the
>>> non-compact representation of Q from QR decomposition?
>>>
>>> Thanks,
>>>
>>> Jeff.
>>>
>>
>> I assume you mean a QR decomposition (I don't know what an LR
>> decomposition
>> is).
>> You can get the answers to your questions by typing
>>
>> ?qr
>>
>> and taking it from there (click on qr.Q).
>> Search the R help first.
>>
>> Berend
>
> LR is the transpose of QR and is used in some system identification
> routines (see for example some of the papers by Picci). I don't
> know if any of the R routines for system identification have an LR,
> but you can do a QR decomposition on the transpose of the matrix.
>
>
I just did a search for LR decomposition with Google.
Interesting: appears to be another name for the LU decomposition.
The transpose of a QR decomposition: wouldn't that be an LQ decomposition?
Berend
--
View this message in context: http://www.nabble.com/LR-Decomposition--tp18072588p18073979.html
Sent from the R help mailing list archive at Nabble.com.
More information about the R-help
mailing list