# Modelling an integer constraint

 0 Hello I need to construct an integer constrain for a situation that if result of an equation is positive it changed to zero and if the result of an equation is not positive it changed to a big number. For example if A-B>=0 Integer constrain=0 and if A-B<0 Integer constrain=big number. Please help me. Tanks asked 23 Dec '14, 10:23 majid 1●1●2 accept rate: 0%

 2 A - B >= - M1 * Z # M1 constant, > max |A - B| A - B <= -eps + M1 * (1 - Z) # eps constant, 0 < eps << 1 == M2 * Z # M2 = big number ...or, perhaps: >= M2 * Z Z binary  answered 23 Dec '14, 16:44 fbahr ♦ 4.6k●7●16 accept rate: 13%
 0 Have you considered other modeling options? Perhaps using a binary decision variable that states if your expression in positive-valued, otherwise 0? This d-var can be implemented in the objective function easily, if that's where the 0/M are supposed to go... answered 28 Dec '14, 11:22 Gunther77 11●1 accept rate: 0%
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