Dear Tang,
wrf_helicity is a built-in function. It's a Fortran routine that was compiled into the "ncl" executable, and hence you don't need to load any NCL scripts to use it.
If you're ever not sure if an NCL function is a built-in function versus one that's available only via a script, then you can go to the documentation page for that function and look at the "Prototype" section. It will tell you what script, if any, you need to load to use the function.
Also, you can tell just from the URL of the function that it is a built-in function:
http://www.ncl.ucar.edu/Document/Functions/Built-in/wrf_helicity.shtml
The "Built-in" part of the URL indicates it's a built-in function.
--Mary
On Feb 17, 2012, at 8:22 AM, Jie Tang wrote:
> hi everyone.
> I am reading same ncl sample functions scripts and WRFUserARW.ncl in NCL6.0. I found
> that there are not the key parameter about "wrf_helicity" in the WRFUserARW.ncl .But
> in the sample script wrf_helicity_1.ncl ,the only load ncl scripts are gsn_code.ncl and WRFUserARW.ncl.
> Can anyone tell me why and where is the wrf_helicity ?thanks
>
> --
> TANG Jie
>
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Received on Fri Feb 17 08:49:18 2012
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