[ncl-talk] ncl built-in function code

[Dennis Shea]

Correct. Only a few selected functions were created in NCL.

Most other computationally intense functions are in fortran or C.

Good Luck

On Sat, Oct 14, 2017 at 6:20 AM, <qinmingyue at mail.iap.ac.cn> wrote:

> Yeah right! I found the ncl versions.
> But it seems not all built-in functions are included in this script
> SHEA_UTIL.NCL. For example EOF is not included.
> So if I can't find the other built-in functions in the script, it means
> there aren't NCL versions of the fortran code, right?
>
> Thank you for your kindly help.
>
> Sophie
>
>
> -----原始邮件-----
> *发件人:*"Dennis Shea" <shea at ucar.edu>
> *发送时间:*2017-10-14 05:52:38 (星期六)
> *收件人:* "Mary Haley" <haley at ucar.edu>
> *抄送:* qinmingyue at mail.iap.ac.cn, "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
> *主题:* Re: [ncl-talk] ncl built-in function code
>
>
> A little 'secret' ....
>
> %> less $NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl
>
> Search for SPECX_ANAL   and SPECXY_ANAL..
>
> These are (one-dimensional) NCL versions of the fortran code. They may be
> easier to follow.
>
> Good luck
>
> On Fri, Oct 13, 2017 at 1:19 PM, Mary Haley <haley at ucar.edu> wrote:
>
>> Hi Sophie,
>>
>> To find the Fortran code for the NCL function, you first need to find the
>> C wrapper for the NCL function, find out what Fortran routine it is
>> calling, and then search for this function in another directory.
>>
>> Here are the steps:
>>
>>
>> 1) Clone the NCL source code from:
>>
>> https://github.com/NCAR/ncl
>>
>> or download it from:
>>
>> https://www.earthsystemgrid.org/dataset/ncl.640.src/file.html
>>
>> 2) Look in the ni/src/lib/nfp directory for the C wrapper file that
>> contains this function (using specx_anal as an example):
>>
>> cd ni/src/lib/nfp
>> grep  specx_anal_W *.c
>>
>> 3) Look at the C file (specxW.c)
>> ​for a line like this:
>>
>> NhlErrorTypes specx_anal_W( void )
>>
>> and then start searching for a call to NGCALLF to
>>  see what Fortran routine this function depends on
>> ​.
>>
>> In this case, it is:​
>>
>> NGCALLF(dspecx,DSPECX)(dx,&inx,iopt,jave,dpct,&scl,work,&ilwork,
>>                        frq_tmp,spcx_tmp,&inspc,sinfo,&ier);
>>
>> 4) ​Cd to the nfpfort directory and search for this routine in the
>> Fortran file directory:
>>
>> cd ../nfpfort
>> grep -i dspecx *.f
>>
>> --Mary
>>
>>
>>
>> On Thu, Oct 12, 2017 at 8:18 PM, <qinmingyue at mail.iap.ac.cn> wrote:
>>
>>> Hi all,
>>>
>>> Where can i find the code for ncl built-in function like
>>> eofunc,specx_anal and so on?
>>> I want to know the detailed calculation steps of the functions.
>>>
>>> Sophie
>>> PhD student
>>> Institute of Atmospheric Physics
>>>
>>>
>>>
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>>
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>
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