Get the date to have a log_file name containing the date

[Benoît Martin]

Hello,

I am using the following command to save my node log in a txt file.

option log_file foo.txt;

I would like to automatically name the txt file with the date. Is it possible to do that in Ampl?

Thanks

Benoît

[Robert Fourer]

The following string expression evaluates to a fixed filename followed by the current date:

ampl: print "foo" & substr(date(),1,8) & ".txt";
foo20160710.txt

You can use this expression in an option statement, as long as you put parentheses around it so that AMPL can recognize that it is an expression:

ampl: option log_file ("foo" & substr(date(),1,8) & ".txt");

ampl: option log_file;
option log_file foo20160710.txt;

Bob Fourer
am...@googlegroups.com

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[Abdulaziz Alghosh]

Hi Robert,

i am trying doing so but AMPL shows always an error saying "date is not defined". May you tell me if you encountered such an error ...

Br
Abdul