Take the 2-minute tour ×  I can't find a way to efficiently use
MIP starts in CPLEX java API.  I have a linear problem that I
need to solve many times by changing just one constraint or
changing the objective so I thought that starting from a
solution (with MIP starts) could be a good way to speed up the
calculations.  So in order to do that, after the first time I
solve the problem, I save all variables in an array of IloNumVar
and double that I pass to my other cplex objects with
cplex.addMIPStart.  The problem is it doesn't speed up anything
it makes it slower and gives me this message :  Warning: No
solution found from 1 MIP starts.  So maybe I shouldn't give the
MIP start all the variables but how do I know what variables to
give it ?  I also tried to change the MIP start effort but it
does not seem to make any difference ...  Why doesn't it make
calculations faster ? Is there a better way to solve many
problems that have just a few differences ?  share|improve this
question You should note that you've c