[gradsusr] Fw: EOF and spectral analysis on GrADS

[tcavazos at cicese.mx]

Here is the link for EOFgrads:

http://www.atmos.ucla.edu/~munnich/Grads/EOF/

Tereza


>  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
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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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>>>
>>>
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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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>>
>>
>> _______________________________________________
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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
> gradsusr at gradsusr.org
> http://gradsusr.org/mailman/listinfo/gradsusr
>


-- 
Tereza Cavazos
Departamento de Oceanografia Fisica
CICESE
Ensenada, Baja California, MEXICO
http://usuario.cicese.mx/~tcavazos/