Hello, 

I have a problem in naming the constraints in my .lp file. I got an error saying I should used named constraints. Based on a past discussion on the subject I tried

constraint con10SH[<j,i> in Sjs][<j,i> in Sjs][p in H];

subject to
{
  //single hoist constraint
  forall(ja in Jit,   ia in 1..rs[rJ[ja]]-1,   jb in Jit,   ib in 1..rs[rJ[jb]]-1,   p in H:        ja!=jb )
    {
      con10SH[<ja,ia>,<jb,ib>,p]:  
        t[<jb,ib>]-t[<ja,ia>] >= alphaSH[<rJ[ja],ia>][<rJ[jb],ib>][p]
                                  -(3-z[<jb,ib>][p]-z[<ja,ia>][p]-y[<ja,ia>][<jb,ib>])*M;
    }; 

};

where

{tupAB} Sjs = {<j,i> | j in Jit, i in 1..rs[rJ[j]]-1};

tuple tupAB 
{ 
 int i1;  
 int i2; 
}

and the following set increases its sizes by one at every iterations until it reaches its maximum size. 

{int} Jit = ...; 

Running this code I have an error saying 

Invalid initialization expression for element "con10SH"

What am I doing wrong? 

Thank you in advance!!

Sam

------------------------------
Samuele Viaro
------------------------------

Hi

{int} Jit = asSet(1..10);
int rs[i in 1..10]=10;
int rJ[j in 1..10]=10;
range H=1..2;




tuple tupAB 
{ 
 int i1;  
 int i2; 
}

{tupAB} Sjs = {<j,i> | j in Jit, i in 1..rs[rJ[j]]-1};

dvar float t[Sjs];


constraint con10SH[<j,i> in Sjs][<j,i> in Sjs][p in H];

subject to
{
  //single hoist constraint
  forall(ja in Jit,   ia in 1..rs[rJ[ja]]-1,   jb in Jit,   ib in 1..rs[rJ[jb]]-1,   p in H:        ja!=jb )
    {
      con10SH[<ja,ia>,<jb,ib>,p]:  
        t[<jb,ib>]-t[<ja,ia>] >= -10;
    }; 

};

works fine.

Can you share a full example with an error so that other users could reproduce your error ?

regards

------------------------------
[Alex] [Fleischer]
[Data and AI Technical Sales]
[IBM]
------------------------------