[gradsusr] Fw: EOF and spectral analysis on GrADS

[Tamer Nada]

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.
>>
>>
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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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