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]
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Original Message:
Sent: Mon March 10, 2025 06:56 AM
From: Samuele Viaro
Subject: named constraints
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
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