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MathGroup Archive 2003

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Re: waiting command

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40243] Re: waiting command
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 28 Mar 2003 04:28:05 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <b5uono$lkb$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

what is with

WaitForExternalFile[command_, filename_String,
    maxCount_Integer,
    pattern_:"*.txt"] := 
  Module[{i = 0, found = False},
    Run[command];
    While[i++ < maxCount,
      Pause[10];
      (* look if the file is created *)
      found = MemberQ[FileNames[pattern], filename];
      If[found, Break[]];
      ];
    found
    ]

and something like

WaitForExternalFile["EMFIELD.EXE -p1 -p2","Results.txt",10000]

should work.

Possibly you get a timing problem, when the program
has not finished the file but Mathematica try
to read from an open file.

The best way would be to write a MathLink program
that return the result to the kernel.

Regards
  Jens


Roberto Brambilla wrote:
> 
> 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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