Re: about local variable in defined function and procedure

Thanks, that's very helpful! I didn't realize we could do assignments
outside of main. Those type of pseudo-globals could be useful for emulating
OO programming in NCL.

But it sounds like it's ok not to declare locals as long we're sure that
those variable names aren't being used outside of a begin/end block.

    Carl

On Mon, Mar 17, 2014 at 9:12 AM, Karin Meier-Fleischer <
meier-fleischer@dkrz.de> wrote:

> 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>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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>
>
> --
>
> <http://www.cicsnc.org/>
> <http://www.facebook.com/cicsnc>
> *Carl J. Schreck III, PhD*
> *Research Associate*
> Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
> North Carolina State University <http://ncsu.edu/>
> NOAA's National Climatic Data Center <http://ncdc.noaa.gov/>
> 151 Patton Ave, Asheville, NC 28801
> e: cjschrec@ncsu.edu
> o: +1 828 257 3140
> CycloneCenter.org: Help analyze tropical cyclones<http://www.cyclonecenter.org/>
> monitor.cicsnc.org/mjo: See recent MJO diagnostics<http://monitor.cicsnc.org/mjo/>
>
>
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>
> --
> Dipl. Geophys. Karin Meier-Fleischer
> Application Support, Visualization
>
> Deutsches Klimarechenzentrum GmbH E-Mail: meier-fleischer@dkrz.de
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-- 
 <http://www.cicsnc.org/>
 <http://www.facebook.com/cicsnc>
*Carl J. Schreck III, PhD*
*Research Associate*
Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
North Carolina State University <http://ncsu.edu/>
NOAA's National Climatic Data Center <http://ncdc.noaa.gov/>
151 Patton Ave, Asheville, NC 28801
e: cjschrec@ncsu.edu
o: +1 828 257 3140
CycloneCenter.org: Help analyze tropical cyclones<http://www.cyclonecenter.org/>
monitor.cicsnc.org/mjo: See recent MJO
diagnostics<http://monitor.cicsnc.org/mjo/>

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Received on Mon Mar 17 07:51:28 2014