user constraint

[Sharonchang]

I'd like to give a bound on the ratio of diesel to gasoline ratio. Is the user constraint I modeled right?

The formulation is

   Diesel/Gasoline《1.2

~UC_T

UC_N

UC_ATTR~LHS

UC_ATTR~RHS

Pset_Set

Pset_PN

Pset_CO

Cset_SET

Cset_CN

Attribute

Year

LimType

UC_COMPRD~LHS

UC_COMPRD~RHS

UC_RHSRTS

UC_RHSRTS~0

UC_GDRATIO

COMPRD

COMPRD,SYNC

OILGAS

2015

UP

1.5

0

5

OILGAS

2050

1.2

OILDST

2015

1

OILDST

2050

1

[Antti-L]

It looks almost right to me.  But make sure the ~UC_T is above the last index column (LimType in your example).

In addition, the UC_ATTR specification requires two indexes, and so I wonder what is the purpose of your UC_ATTR~LHS, with just COMPRD under it?  I would suggest to remove that column.

[Sharonchang]

Thanks a lot!

I've changed the location of ~UC_T, and it does work.

[Sharonchang]

And when I remove the  column of UC_ATTR~LHS, it also works. What situation can the UC_ATTR~LHS be ignored? Only the same attribute with RHS?

[Antti-L]

In your example, you want to apply the SYNC modifier to the COMPRD component of the constraint on the RHS side, and therefore you need the UC_ATTR~RHS with COMPRD,SYNC. But for the LHS side, you are obviously not applying any modifier to any component of this constraint. Therefore, you should not specify any UC_ATTR~LHS.

[Sharonchang]

Thanks a lot!