Re: about local variable in defined function and procedure

Hi,

NCL does not have global variables, but it is possible to simulate a
global variable.
If you initialize the variable x above the procedure dummy(), it works fine.

x = 0

procedure dummy()
begin
....
....
...

See also the FAQ: https://www.ncl.ucar.edu/FAQ/#core_lang_008

Bye, Karin

Am 17.03.14 13:52, schrieb Carl Schreck:
> This is something that still puzzles me too. I'm having trouble coming
> up with an example where a variable doesn't act as local. Consider the
> very simple example below, with no locals defined.
> --
> procedure dummy()
> begin
> print( "Procedure: " + isvar("x") )
> x = 1
> end; dummy
>
> begin; main
> dummy()
> print( "Main: " + isvar("x") )
> x = 5
> print(x)
> dummy()
> print(x)
> end; main
> --
>
> All of the isvar's return false, and dummy doesn't change the value of
> x in main. So what is the non-local behavior?
>
> Carl
>
>
> On Mon, Mar 17, 2014 at 2:10 AM, Jatin Kala <jatin.kala.jk@gmail.com
> <mailto:jatin.kala.jk@gmail.com>> wrote:
>
>
> This is explained here:
> http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclStatements.shtml
> Search for: "The local statement and function and procedure scope"
>
> Those functions which do not have local variables declared, are
> probably for the few functions which do Not define anything new
> within the function, i.e., there is No "x=" within the function
> (hopefully).
>
>
>
>
>
>
> On 17/03/14 4:51 PM, wen wrote:
>> Hi ncl-users and Dennis,
>> I recently define ncl-fuction and procedure by myself to
>> faciliate my processing. I don't think I am familar with the
>> local variable. I find that some functions and procedures
>> pre-defined in "contributed.ncl" and others do not have local
>> variable, but some do. I am wandering when the function or
>> procedure should have local variable. Could you give me some
>> examples to show the necessary to define local variable in a
>> function or procedure. Thank you!
>>
>>
>>
>>
>> --
>> Best regards
>> Guanhuan Wen
>>
>>
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> --
>
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> *Carl J. Schreck III, PhD*
> *Research Associate*
> Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
> North Carolina State University <http://ncsu.edu/>
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-- 
Dipl. Geophys. Karin Meier-Fleischer
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Received on Mon Mar 17 07:13:17 2014