There are builtin functions time and ctime:
ampl: print time();
1243702207
ampl: print ctime();
Sat May 30 11:50:10 2009
ampl: print ctime(time());
Sat May 30 11:50:19 2009
However if you define
param stamp symbolic = ctime();
the value of stamp won't be updated automatically every time you refer to
it. You have to do something to cause it to be updated, such as a reset
data:
ampl: param stamp symbolic = ctime();
ampl: print stamp;
Sat May 30 11:52:34 2009
ampl: print stamp;
Sat May 30 11:52:34 2009
ampl: print stamp;
Sat May 30 11:52:34 2009
ampl: reset data stamp;
ampl: print stamp;
Sat May 30 11:53:09 2009
There are lists of all the functions in the appendix to the AMPL book, but
there's no master list of builtin parameters.
Bob Fourer
4er@...
> -----Original Message-----
> From:
ampl@... [mailto:
ampl@...]
> On Behalf Of Guney Petek [
guneyp@...]
> Sent: Friday, May 29, 2009 7:15 PM
> To: AMPL Modeling Language
> Subject: [AMPL 2552] backtick operator and list of built-in parameters
>
>
> Greetings,
>
> Is it possible to define a variable including the date and time .run
> file is run on? I'd like to name the output file using this stamp
> variable.
> for example: param stamp symbolic:=`shell "date"`; that is, something
> like the backtick operator that do a similar job in BASH...
>
> Secondly, is there a list of all built-in parameters and variables(?)?
>
> thanks //Guney
>
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