The sequece of steps in solving a problem is as follows:
-- you give the "solve" command to AMPL
-- AMPL writes the optimization problem to file "at3916.nl"
-- AMPL invokes the solver with "at3916" as an argument
-- the solver reads the file "at3916.nl"
Thus "can't open at3916.nl" is an indication that the file "at3916.nl" was
not successfully written by AMPL, and yet the solver was subsequently
invoked by AMPL. This might happen, for example, if space runs out on the
disk drive where the file is being written.
The first step in tracking down the specific problem in your case would be
to look for other error messages that appear just prior to "can't open
at3916.nl" -- they might indicate what the problem is. Also you might get
more useful messages if, before "solve;", you give the command "write
btest;" which explicitly directs AMPL to write the file "test.nl" before
asking the solver to read it.
Bob Fourer
4er@...
> -----Original Message-----
> From:
ampl@... [mailto:
ampl@...] On Behalf Of
> Jacob JKW
> Sent: Wednesday, June 11, 2008 6:47 AM
> To: AMPL Modeling Language
> Subject: [AMPL 1821] "can't open at3916.nl" -- swap file error?
>
> When running numerous solves in succession on Windows I frequently
> receive an error of the form "can't open at3916.nl", which then kills
> my ampl process.
>
> I can only assume that this is some swap file issue. Is there anyway
> around this? Perhaps a way to specify that AMPL automatically retry?
>
> Thanks in advance,
> J.
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