Hi Andrew,
Thank you for the prompt reply.
What do you mean by C prepocessor?? Apologies, I know how to program but that’s pretty much it...
On Tue, 2020-11-24 at 18:59 +0000, Manuel Castro wrote:
> Hi there,
>
> I am wondering how I can use an if statement to turn a constraint on
> or off.
> For example in my problem I have the following constraint:
>
> subject to linctr14 {i in PeriodsCount: i == 1}: StorageEnergy[i] =
> (StorageStateCharge * StorageEnergyRating + ((StorageEfficiencyCharge
> * (StoragePowerCharge[i])) - ((StoragePowerDischarge[i]) /
> StorageEfficiencyDischarge)));
>
> Now, I only want to consider storage in my problem if an object
> storage actually exists.
> For that, I would have a StorageStatusFlag which if equal to "1" then
> I would consider the constraint in my problem.
> For example:
>
> If (StorageStatusFlag == 1) then
> subject to linctr14 {i in PeriodsCount: i == 1}: StorageEnergy[i]
> = (StorageStateCharge * StorageEnergyRating +
> ((StorageEfficiencyCharge * (StoragePowerCharge[i])) -
> ((StoragePowerDischarge[i]) / StorageEfficiencyDischarge)));
> end if
>
> This is what I used to do in "mosel" language from FICO Xpress (I
> don't have a license anymore so I am discovering GLPK ). How can I do
> this in GLPK language? What's the workaround that we can use for this?
You could use the C preprocessor.
>
> Many thanks in advance for your help. It's really appreciated.
>
> Kind regards,
> Manuel.
>