use cplex for mixed integer problem but get non-integer output
显示 更早的评论
Hello, i use cplex in my madlab code to solve a mixed integer problem. So I use the function cplexmilp(fu,Aineq,bineq,Aeq,beq,sostype,sosind,soswt,lb,ub,ctype), which should produce integer solutions because ctype only contains I and B. Most of the time it works fine but every now and then I get an "optimal solution" containing entries like -0.0000 or 1.0000 and the rest of my program breaks or gives the wrong output. Do you have any idea where my mistake might be? Thank you
采纳的回答
Alan Weiss
2015-8-26
Nearly any MILP solver uses floating point arithmetic internally, and uses tolerances to decide whether a number is "integer enough."
If you need really integer values for some variables, round them. If intcon is the vector of indices of the integer variables, execute
x(intcon) = round(x(intcon));
or some such thing. See Some Integer Solutions Are Not Integers for a brief discussion of this issue related to the MATLAB intlinprog solver.
Alan Weiss
MATLAB mathematical toolbox documentation
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Get Started with MATLAB 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
