Problem with Linprog: it says it is infeasible while it is feasible

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soroor sarafrazi
soroor sarafrazi 2015-2-9
评论： soroor sarafrazi 2015-8-12
Hi all,
I use linprog to optimize a problem. One of my inequality constraint is: Area * X <= Capacity . When I use this constraint, the linprog says the problem is infeasible but when I use X <= Capacity / Area , the problem becomes feasible. I want to optimize the problem on different data. On most of the data, X <= Capacity / Area makes the problem feasible and sometimes Area * X <= Capacity is helpful. What is the problem and how can I solve it?
another problem is the value of Capacity. Mathematically, when I increase the value of Capacity, the problem should remain feasible but in Linprog, I can not increase this value very much, it gives exitflag = -2 or -3. Why?
Thanks in advance for your help.
Cheers, Soroor

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回答（2 个）

Sean de Wolski
Sean de Wolski 2015-2-9
Do the bounds make it infeasible?
soroor sarafrazi
soroor sarafrazi 2015-2-10
if you mean lb and ub, the answer is "No".
  2 个评论
Sean de Wolski
Sean de Wolski 2015-2-10
There's probably not much else we can help with without seeing the data and code. Can you attach it (as zip file)?
soroor sarafrazi
soroor sarafrazi 2015-8-12
Thanks and sorry for the late reply. I simplified the model which helped to avoid the error magnification.

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