Originally posted by: 37N6_Michael_Masin

Hi,

I would like to store the best MIP solution found so far using writeMIPStart(<file name>, mipStartId);

Two main candidates for mipStartId are 0 or getNMIPStarts()-1.

What is the correct answer?

Thanks,

Michael Masin

The correct function to use here is writeSolution(char const *filename). That will write the incumbent solution (the best solution found) to a file. MIP start and solution files have the same format, so you can use them interchangeably.

Originally posted by: 37N6_Michael_Masin

Thank you, I'll try. Should I use readSolution("filename") or readMIPStarts("filename") before  solving again?

You should use readMIPStarts().

Originally posted by: 37N6_Michael_Masin

Looks like the incumbent solution is stored among MIPStart solutions with index 0: writeSolution(filename) and writeMIPStart(filename, 0) store the same solution.

You should not use writeMIPStart() in new code because it is deprecated. It is true that at the moment the best solution is the first MIP start. However, the order of MIP starts is not explicitly specified and may change eventually.