[gradsusr] Fw: EOF and spectral analysis on GrADS

[Tamer Nada]

 http://www.netlib.org/lapack/patch-3.0/src/
for example
Given a square (N,N) real non-symmetric matrix, compute the eigenvalues
and, optionally, the left and/or right eigenvectors via the LAPACK
subroutine :-

SVD Method
http://www.netlib.org/lapack/patch-3.0/src/dgeevx.f

On Sun, Jan 27, 2013 at 2:21 AM, Jose <veiga.uea at gmail.com> wrote:

> Dear Tamer Nada
>
> Thank you by your explanation and suggestions. They were clear.
>
> By the way do you know where can I found the fortran subroutines from
> lepak library you commented?
>
>
> Thanks in advance
>
> Enviado via iPad
>
> Em 26/01/2013, às 16:53, Tamer Nada <tamer540 at gmail.com> escreveu:
>
> Dear :- Jose Augusto Paixão Veiga
>
> In Fortran :-
>
> You must know there is about 3 methods ( algorithms )  to calculate eigen
> Vector and eigen Value  each method some of it efficient but just compute
> only first Eigen value and first Eigen vector by suggest value and using
> iteration methods to compute it until reach to the difference between old
> value from last iteration to new value equal small fraction you can
> determine it . another to methods using "SVD "  and this method its divided
> by to relative to the shap of data matrix   and some of it efficient but
> slow and some fast and not efficient
>
> I suggest to you to use lepak library in fortran ( its easy to call
> subroutine ) or using high level language or statistical or climatic
> package like NCL or R or Matlab
>
> On Sat, Jan 26, 2013 at 9:56 PM, Jose Augusto Paixão Veiga <
> veiga.uea at gmail.com> wrote:
>
>> Dear EOF expertise,
>>
>> one of you would have a material given instruction (if possible step by
>> step) on how to calculate EOF?
>>
>> I would like to do a fortran program, from the initial point (for
>> example: 1-read a 3-d matrix data, 2-calculate its inversion, 3-multiply it
>> by its ....), to calculate EOF for climate study purposes.
>>
>> A flux diagram will be very appreciated.
>>
>> Thanks in advance.
>>
>>   Augusto
>>
>>
>> On Jan 26, 2013, at 3:41 PM, Tamer Nada <tamer540 at gmail.com> wrote:
>>
>> on Grads No, but you can use NCL  or R to compute EOF; and Only R  or
>> Matlab to Compute CCA ,But also you can Use NCL to compute "SVD" and after
>> that you can compute CCA ,actually NCL have function to compute CCA ,But
>> not efficient because  its use old IBM Fortran subroutine ,so its not work
>> fine with big array of data and may be hang in calculation ,so i prefer to
>> use SVD function and after that you can compute CCA
>>
>> On Sat, Jan 26, 2013 at 9:58 AM, ugo okoro <uknac23 at yahoo.com> wrote:
>>
>>>
>>> Dear all,
>>>
>>> Please any info on how to run EOF and spectral analysis (frequency-time)
>>> on GrADS?
>>>
>>> Anticipating prompt response.
>>>
>>> Thanks.
>>>
>>> Ugo Okoro.
>>> CMSR-IAP
>>> CAS, Beijing.
>>>
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
>>>
>>
>>
>> --
>> =====================
>> *Tamer Ali Nada *
>> **
>> *Research Worker*
>> **
>> *Cairo Numerical Weather Prediction Center { CNWP}*
>> **
>> *Egyption Meteorological Authority   { EMA }*
>> **
>> *Cairo , Egypt*
>>  ============================
>> *tamer540 at yahoo.com
>> tamer540 at gmail.com
>> tamer.nada at noaa.gov*
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>> gradsusr mailing list
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>>
>>
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>>
>
>
> --
> =====================
> *Tamer Ali Nada *
> **
> *Research Worker*
> **
> *Cairo Numerical Weather Prediction Center { CNWP}*
> **
> *Egyption Meteorological Authority   { EMA }*
> **
> *Cairo , Egypt*
>  ============================
> *tamer540 at yahoo.com
> tamer540 at gmail.com
> tamer.nada at noaa.gov*
>
> _______________________________________________
> gradsusr mailing list
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>
>
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>


-- 
=====================
*Tamer Ali Nada *
**
*Research Worker*
**
*Cairo Numerical Weather Prediction Center { CNWP}*
**
*Egyption Meteorological Authority   { EMA }*
**
*Cairo , Egypt*
 ============================
*tamer540 at yahoo.com
tamer540 at gmail.com
tamer.nada at noaa.gov*
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