[ncl-talk] Question about data in enviroment

[Rick Brownrigg]

Hi,

Its not possible to preserve the data in memory between successive runs of
NCL, in the way you are trying to do it.  You would need to move the
eventing and system-level stuff that causes your bash script to run
periodically into NCL. Without knowing what you are trying to do, its hard
to make a specific recommendation, but it might look something like:

- Read the NetCDF file into memory

- loop "until done"
  check for condition/event, and if its time, run the main part of the NCL
script to create a new NetCDF file
  otherwise, wait/sleep for some time to elapse and then loop

Useful NCL functions for this purpose are system(), systemfunc(), and
sleep(), and possibly getenv().

Make sense?
Rick

On Wed, Jan 3, 2018 at 7:47 AM, Damjan Jelic via ncl-talk <ncl-talk at ucar.edu
> wrote:

> Dear support,
>
> suppose i have one big 2dfield (time/values) and i have ncl program to
> extract particular time intervals delivered with bash script.
> Every time the bash script sets new time interval ncl script is run again
> and the problem is it takes some time to load this big 2dfield.
> How can i convince ncl script to leave this big data in ram/environment so
> it dos not need to load every time?
> big 2d field is in .nc format and ncl script just sorts data and saves new
> .nc subset.
>
> maybe its a silly question but i never needed that and im not able to
> goggle out the issue.
>
> Thank aloft.
> Damjan
>
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