Originally posted by: AndyHam

Dear IBM,
I always thank for valuable feedbacks I have received from this forum.

How to report ObjValues in different timelimits?
I need to report the ObjValues in 1, 5, 60, and 180 seconds, respectively. Right now, I am reporting them in the following way, which is an inefficient way, namely, solving 4 times. I have two wishes:
1. solve a problem just once with 180 s and report ObjValues for four different timelimits.
2. identify optimality of each ObjValue (right now, I compare SolveTime with timelimit. If SolveTime < timelimit, then I assume it is optimal.)

For instance, I would like to generate the following logs:
//timelimit,   solve time to hit the best solution,           obj value,     optimality
"1   secs,                    1.10,                                                       , 200          , no
"5   secs,                    2.98,                                                       , 198          , no
"60 secs,                    47.17,                                                     , 192          , yes
"180 secs,                  47.17,                                                     , 192          , yes
(note "the solve time to hit the best solution" can be much shorter than timelimt)

for(var i=1;i<=4;i++)
{
var tLimit;
if (i==1) tLimit=1;
if (i==2) tLimit=5;
if (i==3) tLimit=60;
if (i==4) tLimit=180;
cp.param.timelimit=tLimit;
if (cp.solve()) {
     ofile.writeln(i + "sec," + cp.info.SolveTime+ "," + cp.getObjValue());
} else {  
      ofile.writeln(i + "sec," + cp.info.SolveTime+ "," + "no solution");
};

Any help will be appreciated.
Andy

Hi,

why not using a loop such as

thisOplModel.generate(); 

cp.startNewSearch(); 

while(cp.next()) 

{

  writeln("obj = ", cp.getObjValue(),  " | time = ", cp.info.SolveTime);

} 

cp.endSearch();  

?

regards

Originally posted by: AndyHam

Thanks for the quick feedback. I can use this code to generate all different ObjValues with exact times. Then, I can manupulate the log to extract what I want. Thanks again!