title: GAMS Error: Endogenous function arguments not allowed in linear models
body: <p>I am trying to solve in GAMS for the binary variables using MIP but am constantly getting an error. I am unable to understand the reason. Anyone got a solution?</p>
  
  <pre><code>Set i cities /1*7/;
  Binary variables z1,z2,z3,z4,z5,z6,z7     1 if selected and 0 otherwise ;
  variable y ;
  Equations con1,con2,con3,con4,con5,con6,con7,obj ;
  obj..  y =E= z1*10+z2*6+z3*7+z4*8+z5*13+z6*9+z7*8;
  con1.. min(z2*6.1,z3*15.2,z4*17,z5*16.8,z6*8.4,z7*16.6) =L= 10 ;
  con2.. min(z1*6.1,z3*7.6,z4*16.0,z5*11.3,z6*2.2,z7*11.9) =L= 10 ;
  con3.. min(z1*15.2,z2*7.6,z4*22.0,z5*17.3,z6*10.2,z7*16.7) =L= 10 ;
  con4.. min(z1*17.0,z2*16.0,z3*22.0,z5*12.1,z6*14.8,z7*7.2) =L= 10 ;
  con5.. min(z1*16.8,z2*11.3,z3*17.3,z4*12.1,z6*9.4,z7*2.9) =L= 10 ;
  con6.. min(z1*8.4,z2*2.2,z3*10.2,z4*14.8,z5*9.4,z7*9.2) =L= 10 ;
  con7.. min(z1*16.6,z2*11.9,z3*16.7,z4*7.2,z5*2.9,z6*9.2) =L= 10 ;
  
  Model planmall /all/ ;
  
  Solve planmall using MIP minimizing y;
  
  display z1.L,z2.L,z3.L,z4.L,z5.L,z6.L,z7.L,y.L;
  </code></pre>