Dear All,

I am trying to define if then constraint for my model.

Somehow, I get error message at my two constraints and it says in feasible due to rhs 0.

How can I define my constraint that I can solve the problem.

I appreciate your help very much.

Regards

CLOW(p,t) Failure cost with low reliability

CHIGH(p,t) Failure cost with low reliability

GR Given Reliability

R(p,t) reliability of a product calculated based on Lambda at time period t

;

CLOW(p,t)=1000;

CHIGH(p,t)=50;

GR=0.5;

R(p,t)= Rc(p,t,“R”);

binary variables

Y1 binary variable

Y2 binary variable;

variable

h

;

Equations

Obj

Const1(p,t) if reliability of product less than a given reliability value, then Y one is equal to 1

Const2(p,t) reliability of product bigger than a given reliability value, then Y two is equal to 1

Const3 binary varible total

;

## Const1(p,t)… Y1$(R(p,t)lt 0.5)=e=1;

Const2(p,t)… Y2$(R(p,t)gt 0.5)=e=1;

Const3… Y1+Y2=e=1;

Obj… h=e=sum((p,t),CLOW(p,t)*Y1)+sum((p,t),CHIGH(p,t)*Y2);

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