[ncl-talk] ncl built-in function code

[Dennis Shea]

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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