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MathGroup Archive 2003

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Re: waiting command

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40257] Re: waiting command
  • From: atelesforos at hotmail.com (Orestis Vantzos)
  • Date: Fri, 28 Mar 2003 04:31:20 -0500 (EST)
  • References: <b5uono$lkb$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Begin by setting the proper directory:
SetDirectory["C:\\mydir\\"]

Then evaluate the following:

If[FileNames["Results.txt"]==={},
   (* if the file initially does not exist, check  whether it exists *)
   check:=FileNames["Results.txt"]==={},
   (* otherwise, check whether the modification date has changed *)
   With[{oldDate=FileDate["Results.txt"]},
      check:=FileDate["Results.txt"]===oldDate
   ]
];
Run["EMFIELD.EXE -p1 -p2"];
(* check every 30 sec whether the file is ready *)
While[check,Pause[30]];

The While loop will exit when the job is done.
Adjust the 30 seconds interval to appropriate value.

Orestis



Roberto Brambilla <rlbrambilla at cesi.it> wrote in message news:<b5uono$lkb$1 at smc.vnet.net>...
> Hi,
> 
> I'd like to use Mathematica to run an extermal program,
> let me say EMFIELD.EXE with some parameters p1 , p2 :
> 
> Run["EMFIELD.EXE -p1 -p2"]
> 
> The external program put results in the ascii file Results.txt
> (a filename that I can change every time).
> Then I read results from it with 
> 
> ReadList["Results.txt", Number,...]
> 
> After an analysis of them inside the same session of Mathematica,
> I modify the parameters p1, p2 and run again the external program.
> And so on for many times until analysis is OK.
> Since EMFIELD may take seconds or hours to generate the results,
> depending on the complexity of the problem and the values of parameters,
> how can I tell Mathematica to wait until the Results.txt file is
> created or updated? Pause[n] would be fine if I knew n, but this is
> not the case and putting a guessed large n is a poor solution
> (offending Mathematica lovers!).
> 
> Many thanks, Roberto
> 
> 
> Roberto Brambilla
> CESI
> Via Rubattino 54
> 20134 Milano
> tel +39.02.2125.5875
> fax +39.02.2125.5492
> rlbrambilla at cesi.it


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