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

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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

Answers (2)

Sean de Wolski
Sean de Wolski on 9 Feb 2015
Do the bounds make it infeasible?

soroor sarafrazi
soroor sarafrazi on 10 Feb 2015
if you mean lb and ub, the answer is "No".
  2 Comments
Sean de Wolski
Sean de Wolski on 10 Feb 2015
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 on 12 Aug 2015
Thanks and sorry for the late reply. I simplified the model which helped to avoid the error magnification.

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