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<p class=MsoNormal><span lang=EN-US>Dear group,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I loop through 48 subsequent files and
create maps from them.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Several of the weatherdata are cumulative,
adding all precipitation from the runtime to the hour of the prediction.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I would like to show maps of precipitation
in the time period. E.g. of time #23 by subtracting val.#22 from val.#23. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I need 2 files to be open at the same time
to accomplish that. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I am looking for a memory efficient way to
open and close files, in a loop for all files. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>This setup came to mind:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display 2-1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Close 1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 3<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display 3-2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Close 2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 4<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display 4-3<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>But I am only allowed to close the most
recently opened file.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>If I stop closing files I will end up
having loads of files open: <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.2- val.1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 3<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.3- val.2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open 4<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.4- val.3<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>(repeat until #48)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Close 1-48<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>when I’m at the 23<sup>rd</sup>
timestep I have file #1,#2 …. #23 open. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I’m afraid the server will crash
having so many files open.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I just need #22 and #23 for that display
moment.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Or I have to close all files and re-open
the last as # 1: file #22 becomes file 1 and file #23 becomes file 2: <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #22 (1)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #23 (2)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.2- val.1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Close #23 (2)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Close #22 (1)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #23<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #24<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.2- val.1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Close #24<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Close #23<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>But closing a file (#23 in this case) to
immediately open it again seems inefficient.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Is there a smart way to handle this?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>I was pondering:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.2- val.1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #3 AS and REPLACING 1<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.1- val.2 (effectively:
#3-#2)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Open #4 AS and REPLACING 2<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Display val.2- val.1
(effectively: #4-#3)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Is that possible?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>FYI: I’m using a php script to send
commands to opengrads, so I’m quite flexible with the available loops. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US>Chris<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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