Re: How do I properly close a file after opening it using addfile

From: Petroski, Thomas J - MLC <tom.petroski_at_nyahnyahspammersnyahnyah>
Date: Mon Jul 30 2012 - 08:27:41 MDT

Thank you Dennis and Wei. I want to make sure I am not unnecessarily using memory as I only need to have one file open at any given time.

Tom

-----Original Message-----
From: Wei Huang [mailto:huangwei@ucar.edu]
Sent: Monday, July 30, 2012 9:24 AM
To: Dennis Shea
Cc: Petroski, Thomas J - MLC; ncl-talk@ucar.edu
Subject: Re: How do I properly close a file after opening it using addfile

Tom,

The proper way to close a file is use function delete.

f = addfile("flnm", "r")

use f for something.

delete(f)

After delete, memory used by f and even f itself is cleared (which means f can be used for any other purpose, hereafter).

If you have some files in same structure, then you can use the way Dennis suggested, which is variable (file) reuse.
Which will be more efficient, as it eliminates the steps of re-create file and delete file (by just re-use the file).

Regards,

Wei

huangwei@ucar.edu
VETS/CISL
National Center for Atmospheric Research P.O. Box 3000 (1850 Table Mesa Dr.) Boulder, CO 80307-3000 USA
(303) 497-8924

On Jul 30, 2012, at 7:59 AM, Dennis Shea wrote:

> In NCL, there is no need to close a file after opening it.
> Don't know your setup but
>
> diri = "./" ; "/what/ever/"
> fili = systemfunc("cd "+diri+" ; ls foo*.grb")
> nfili = dimsizes(fili)
>
> do nf=0,nfils-1
> f = addfile(foo(n), "r") ; open
> :
> :
> end do
>
> Each time through the loop the file reference (ie, pointer) is changed.
>
>
> On 7/30/12 7:33 AM, Petroski, Thomas J - MLC wrote:
>> Hello NCL Users -
>>
>> I am using "addfile" to open a GRIB2 file in my NCL code. After
>> reading in the data and storing to local NCL variables, I want to
>> close the GRIB2, then open another GRIB2 file. What is the best way
>> to close the first file before opening a second one?
>>
>> Thank You,
>>
>> Tom
>>
>> _______________________________________________
>>
>> *Thomas J. Petroski*
>>
>> /GMRT Commodities/
>>
>> Bank of America Merrill Lynch
>>
>> Email: tom.petroski@baml.com <mailto:tom.petroski@baml.com>
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